Builds Of The Week

Our Build of the Week this week comes from Lisa Supon. This AR was designed and built specifically to shoot 3-Gun. Lisa needed a lightweight, quality rifle, and when she began shopping she found that everything prebuilt on the market that fit the bill was prohibitively expensive - so she decided to build her own rifle to her own liking. Between the weight, the quality, and the blue accents Lisa’s build is a 3-Gun worthy rifle with a lot of good pieces worth talking about.

Getting into 3-Gun

If you’ve never been involved in the shooting sports, be forewarned that they are addicting. Once you choose to get started in 3-Gun you’ll find yourself dreaming about your next gun build (whether or not it looks something like this one).

3-Gun is a popular shooting sport that utilizes pistols, rifles, and shotguns across a wide variety of run and gun courses. Step one for any competition is to find a match to shoot, sometimes just going to watch a match helps people who are very new to shooting sports understand the necessary equipment and how the safety rules work better than anything else (and if you’re not careful someone will lend you the equipment and help you get started then and there!). Even if your local gun range doesn’t hold matches themselves, most ranges will know where the nearest 3-Gun matches are held - if you don’t have a go-to gun range yet, you can use the NSSF’s wheretoshoot.org tool to find a range near you.

The guns required for 3-Gun are pretty basic: you need a pistol, a rifle, and a shotgun. Different divisions within 3-Gun competition are available depending on the equipment you have access to, although many people who get invested in the sport choose to build their equipment to their division of preference.

Building a light rifle, like this one, makes sense for shooting 3-Gun. Lighter rifles are less likely to cause fatigue when you are spending all day on the range literally running around with your gun. Lisa’s desire for quality is all sensible in the context of 3-Gun since firearms used in the sport are run hard and tend to break a lot more frequently than regular range toys.

Rainier Arms UltraMatch Billet Lower

The Rainier Arms UltraMatch Billet Lower Lisa chose is CNC machined from solid billet 7075 aluminum, and finished with mil-spec hardcoat anodize to a surface hardness of 60 Rockwell. There are a lot of items that are compatible with this lower, and using it as a starting point for a straightforward, quality build is a very practical move.

The ambidextrous nature of the Rainier Arms UltraMatch Billet Lower is an important note for someone who is looking to get into 3-Gun. One thing about 3-Gun stages is that you never know what you’re going to get, and that includes having to shoot from awkward angles or even off-hand. Having ambidextrous controls and occasionally practicing with them allows you to manipulate your firearm no matter what weird position the course designer places you in.

CMC AR-15 Drop-In Trigger

CMC has a wide variety of triggers available for rifle enthusiasts. Their standard AR drop-in trigger is available in both curved and straight variations and comes factory pre-set to two pounds, an excellent weight for a 3-Gun competition AR.

CMC triggers boast an ultra-crisp break with a positive reset, these attributes help 3-Gun shooters make their shots quickly and accurately, without any question about what’s going to happen when the trigger is pulled. They are also quick and easy to install, which is valuable if you’re doing your own build and are in the process of learning how to piece together a rifle.

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CMC Trigger 2 Stage Curve 1/3
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Rainier Arms FHV2

Putting the proper flash hider on a gun can be a difficult decision for a 3-Gun shooter. Limiting muzzle rise and being able to transition from one target to the next quickly is an important part of succeeding in competition for skilled shooters. For the rest of us - it can be as simple as limiting noise and flash so there’s less distraction while you’re shooting, it can come down to aesthetics, or it can even come down to suppressor compatibility so you can have multi-functional firearms.

The FHV2 that Lisa opted to put on her gun is Rainier Arms’ latest edition to the Flash Hider market. It’s a highly functional and aesthetically pleasing flash hider available in 1/2x28 or 1/2x36 thread pitches. It comes in both a Satin and Black Nitride finish, so you can pick whichever one matches the look of your gun.

Whether you’re building for 3-Gun or time on the range, having a quality and lightweight gun can make your day more enjoyable, and piecing the build together yourself can ensure that you’re getting the proper parts every step of the process. Have a Build of the Week to share? Let us know by emailing [email protected]!

This week’s build of the week comes from one of our employees. It is an AR pistol with interchangeable uppers that allow it to be easily transition from a fireball-throwing .223 to a suppressed .300 BLK.

.223 vs. .300 BLK

The conversation surrounding .223 and .300 BLK has been going on since the Blackout cartridge was introduced. There are benefits to each, and each certainly has its place on an AR pistol build. .223 is one of the most readily available cartridges on the market, it also has a longer range capability as it is a smaller, faster round. This same range capability also means that it has lower energy than .300 BLK closer than 200 yards, and is designed to be suppressed.

The best way to choose between .223 and .300 BLK is, of course, not to. Your standard .223/5.56 AR lower and magazine are also compatible with .300 BLK, so all that’s necessary to swap between the two calibers is a different upper and some different ammunition. For this particular build, we have two complete uppers from Primary Weapon Systems: one in .223 Wylde and one in .300 BLK. Each has its own optic and flashlight, and features a KeyMo mount that works with the Dead Air Sandman-K - a 7.62mm suppressor that works for both .223 and .300 BLK.

Buying a Complete Upper

Purchasing a complete upper is a great way to simplify the AR building process. Between the gas system, the barrel length, and the handguard there is a lot that needs to fit together right to have a functional and aesthetically pleasing upper receiver, so for newer AR owners purchasing a complete upper is an excellent way to do a partial AR build and get exactly what they want without over complicating the process. This can be especially beneficial if you’re planning to purchase two uppers to switch between .223 and .300 BLK. Purchasing similar upper receivers from the same manufacturer ensures consistency and reliability in your firearm. There are also a lot of ways to continue to personalize an upper even when it’s purchased complete. Between flashlights, red dots, and hand stops there are a lot of aftermarket options to continue to build on a complete upper receiver.

Rainier Arms Select Barrel

The Select Barrel is made from a high-precision match blank to Rainier Arms specifications. They are chambered and crowned by hand and feature a 5-groove polygonal rifling that allows for greater accuracy and less erosion over time. The barrels are dimpled, which is a simple thing, but ensures your gas block is properly aligned. They are made in stainless steel - which ensures the longevity of use - and available in both satin or black nitride finishes. What all of this boils down to is that this is a highly accurate barrel designed for hard use and made to last at a price point that makes it accessible to anyone for the purpose of any build.

Primary Weapon Systems Mk1 MOD 2 Complete Upper

Primary Weapon Systems is known for their high-quality AR-style builds. Their Mk1 MOD 2 is not only an example of this but probably one of their most iconic pieces. Not only is it a favorite among their employees, but has been used successfully for a wide variety of activities - including hog hunts and SWAT training courses.

The free-float handguard is fully forged and has both Picatinny and M-Lok mounting systems. They’ve eliminated the forward assist to save on weight and equipped the upper with a Radian Raptor Charging handle. There is a 3-setting adjustable gas system and the barrel has a 1:8 twist rate.

Lantac Dragon Muzzle Brake

The Lantac Dragon Muzzle Brake that is featured on this build uses their “Short Energy Pulse system” to reduce the length of recoil so that energy doesn’t lap over shot for shot to throw the shooter off target. The Lantac Dragon features a KEYMO mount, fully licensed from Dead Air, which works with the Sandman silencer line from Dead Air, shown here on the .300 BLK upper. The product is fully licensed from Dead Air and will not affect the warranty on a Dead Air suppressor.

Neomag Sentry Strap

The Neomag Sentry Strap is a nifty addition to this build that might go overlooked by those unfamiliar with the product. It’s a simple strap with a magnetic clasp that wraps around the handguard where it meets the receivers and is used to stage the sling. The idea is that a sling can be kept tucked against the gun when not in use, then a simple tug can deploy it when it is time to sling the gun.

It’s easy to see in Neomag’s video on the Sentry Strap:

Guns are frequently purpose-built. They could be purpose-built for self-defense, for law enforcement or military, for long-range shooting, for competition, but the direction that having a purpose gives a gun is important to how a build is put together.

Our build of the week this week was very specifically purpose-built for one important job: giggles.

The story is pretty simple: My household needed a .300 blackout pistol. We needed a .300 blackout pistol because everybody needs a .300 blackout pistol, it’s called self-care. Fortunately, I live the type of life where there are extra AR lowers hanging out around my house and it was decided one would become a self-care gun. Once this was decided I started doing what any gun industry employee excels most at: shopping for gun parts. (And by shopping for gun parts I mean asking my more knowledgeable coworkers, “What should I buy?”)

To say I’m happy with the build we ended up with would be putting it mildly - this little pistol is going to be a good time on the range for shooters of all different levels and will be in my range bag no matter who I’m headed to the mountains with. One of the benefits of AR pistol builds is how accessible they are to different shooters: they’re easy to shoot and have low recoil so new shooters can handle them comfortably, and they’re small and light enough that shooters with a slighter frame have no issue handling them even over more extended periods. I was on a budget with this build - not a tight budget, but you can see where I splurged (and where I didn’t). So without further ado let’s dive into this AR pistol build and see what some of the industry’s most hardcore AR nerds helped me put together for a fabulously fun and relatively affordable .300 blackout:

Arms Republic AR-15 Lower Parts Kit

When I was shopping for a lower parts kit I had a few things on my mind. I knew I wanted something basic and reliable because I figured I would probably be upgrading it over time. Down the road I want to get a fancy trigger, an extended safety, and maybe add some splashes of color to the gun, but for now? For now, I needed a lower parts kit that was affordable, available, and I could trust to get the job done.

There are quite a few of these lower parts kits available on the market. For parts like these, the most important thing is to make sure you're sourcing your parts kit from a manufacturer you trust. While lower parts can be upgraded over time, they can also play a huge factor in how your gun functions, so ensuring you're getting quality parts at whatever price you're looking at is still key.

SB Tactical SBA3 5 Position Pistol Stabilizing Brace

The SB Tactical SBA3 Brace was developed in 2012 by USMC and Army veteran Alex Bosco. The design was based on experience Bosco had while shooting a disabled combat veteran in an effort to help both Bosco’s friend and other wounded combat veterans safely fire an AR pistol. In November of 2012, the ATF sent an approval letter for the brace, resulting in the formation of SB Tactical by Bosco and Grant Shaw and they began making production prototypes for AR and AK platforms. By 2013 they had sales agreements with SIG SAUER and Century Arms International, and in May 2013 the first Pistol Stabilizing Braces were delivered into the marketplace.

The SB Tactical SBA3 Brace is one of the most popular additions to AR pistols on the market. The brace attaches to any mil-spec carbine receiver extension and is 5-position adjustable. It is an invaluable addition to any AR pistol to increase versatility and stability without adding a lot of weight.

V Seven Weapon System Hyper-Light Magnesium AR-15 M-LOK Handguard

Weight was a consideration when designing this AR pistol. For smaller framed shooters too much weight on the front of the gun can lead to a less than pleasant shooting experience. As a smaller-framed shooter myself, I knew I had to either save weight on the rail or the barrel if I wanted this gun to turn out how I wanted.

I opted to go for a lighter handguard, partially because I think the bigger, cheaper handguards give ARs, especially little pistols, a really clunky look. This way I could keep weight down without having to worry about searching for a fluted barrel, which kept me right where I wanted to be: shopping for a Rainier Arms Select barrel. (More on that later.)

Rainier Arms Precision Match Grade AR-15 BCG

One place where I tend not to skimp when it comes to my AR builds is the bolt carrier group. This is such a key component to how the gun runs that I just don’t believe it’s the time to try and save a couple of dollars.

The Rainier Arms Precision Match BCG is heat-treated and nickel boron plated, it’s MPI/HP tested, marked, and comes with a limited lifetime warranty. In a nutshell: nothing’s going to go wrong with this BCG, but if something does go wrong - and as long as I don’t do anything stupid - there’s a warranty to cover it.

This is a high-quality bolt carrier group that will keep this little pistol running and running well. The last thing I want to have to worry about is trying to figure out why my gun isn’t cycling when I’m on the range, or give a firearm that isn’t shooting well to someone who’s new to shooting. Not only can handing a gun that doesn’t function well to a newbie mar their experience, but it can also be dangerous as they try to navigate requesting help with a loaded firearm in hand.

Forward Controls Design 6310KM Keymo Mount

What’s the point of buying a .300 blackout if I’m not going to suppress it? I’m sure there might be one, but suppressors are an important part of self-care. Even though I don’t have one yet, I know that someday this little pistol will be quietly pewing subsonic ammunition, and I built it with that purpose in mind.

The Forward Control Design Flash Suppressor features a Keymo mount, which means I’m set up for whenever I pick up that Dead Air Suppressor. Forward Control Designs is dedicated to creating form-fitting and user-centric AR parts, they believe in elegant simplicity and that was all I needed on the front of this gun. Plus the alignment notches double as wire cutters - what more could you possibly want?

Rainier Arms Select 300BLK Barrel - 8" Nitride

The barrel is another really important part of any build. I wanted the best barrel I could get without spending a fortune, and when it comes to value and quality it’s pretty much impossible to beat the Rainier Arms Select line.

I feel like I end up talking about the Select barrels in a lot of the Build of the Week write-ups, which speaks quite accurately to how we feel about them here at Rainier Arms. They are highly accurate barrels designed for hard-use and available at an incredibly accessible price point. Yes, I could’ve opted for a fluted match barrel, but as it is this gun weighs in at just over four pounds (4.142, if you must know) as it is, and the extra weight savings didn’t justify the price jump in a short-barreled pistol that was never going to need the match-grade precision.

Putting this build together was a lot of fun. I felt like I learned a lot and I know it’s going to create a lot of good memories on the range. I think sometimes it’s important for us to step back and remember why we’re excited about shooting, and remember how much fun it can be just to go to the range with friends. There’s no shame in having guns designed around this premise, and I’m happy to have added this .300 blackout pistol to the safe.

We had some fun with our Build of the Week this week. We knew we were going to the range and decided to combine some known favorites and some new favorites to put together a new old rifle build that could achieve a little distance and look the part.

One of the goals with this build was versatility. We wanted to put something together that would be usable for close-quarters engagements, but easily adaptable to reach out and touch medium-range targets.

Something Known: BLK LBL Bipod

The BLK LBL Bipod lived on this gun close to a year ago, we had replaced it with a different rail and bipod combination for a while, but decided it was time to go back to BLK LBL’s innovative integral bipod system in order to create a gun that was able to get some distance but was also easily usable in close quarters scenarios.

Designed and manufactured in Canada, the BLK LBL sits flush with the rail when it’s not in use, and then is deployed using large metal buttons that sit on top of the bipod’s ball and socket joints.

The BLK LBL holds a lot of the same benefits as a traditional bipod. The joints don’t hold a lot of tension, so movement between targets is fluid and readjustment is easy. The legs extend for 6.5” to 9.5” and lock in place. The ball and socket joints allow for 40 degrees of tilt so the scope can be leveled regardless of the terrain.

While the way the bipod pulls up into the rail is what makes this design innovative, there are a lot of other features that the BLK LBL brings. For example, the barrel-through layout, natural to the rail-integrated design, allows the barrel to sit inside the bipod instead of on top of it. This results in improved stability and a better feel while you’re aiming the gun.

Something Known: Devil Dog Concepts Hard Charger

The Devil Dog Concepts Hard Charger is another part that is familiar to this gun, and I have found it particularly useful for bipod systems. On a setup like this, it allows you to charge the rifle without losing your cheek-weld, or your view of the target.

The Devil Dog Concepts Hard Charger is designed to change any standard AR-15 or AR-10 platform into a side-charging system. The non-reciprocal design replaces the existing charging handle and attaches to a top Picatinny rail, making it super simple to install.

The Hard Charger was designed to solve common issues with the standard charging handle seen by military and law enforcement personnel. It utilizes gross motor skills and has five different pull handle options, from traditional to extended competition, so that users can customize their charging handle to fit their purpose and preference. The Hard Charger is also customizable depending on your optic set up and can be mounted in three different rail slots depending on where you want the Hard Charger to sit on your Picatinny rail.

Something New: Rellim Arms Stock Adapter Kit

The Rellim Arms replaces the rifle’s buffer and buffer tube so that the stock can be completely removed, shortening the footprint of the gun for easier transport and carry. It was a good addition to this gun, which for a .223 can be a little large to just stick in the back of a car and take to the range.

The Rellim Arms Stock Adapter Kit is CNC machined from 7075 T6 Aluminum and features a Mil-spec Type II Class 2 Hardcoat Anodizing. It is manufactured and assembled in the USA and includes a limited lifetime warranty.

It is important to note that the gun cannot be fired without the stock attached. This is actually a key detail that helps keep your gun legal since in an operational format a rifle must be at least 26” in length.

Something New: Swampfox Trihawk 3X30 MOA Prism Scope

Swampfox is a new optics company that is becoming a common name in the tactical industry. They are dedicated to designing and building reliable, high-performance tactical optics and making them available at affordable prices. So far that’s exactly what they’ve done.

The Trihawk is a 3X scope features a super wide, true ten-degree field of view and was a good option for a gun that seems to have ended up ideal for quicker engagements at medium range. The Trident reticle is good for fast acquisition up close - so when the BLK LBL is folded in - but also has the medium-range capability and is available with either 5.56/.308 BDC or MOA ladder in red or green.

Filters

Blog posts

Builds Of The Week

Filters

Blog posts

Builds Of The Week

Getting into 3-Gun

Rainier Arms UltraMatch Billet Lower

CMC AR-15 Drop-In Trigger

Rainier Arms FHV2

Yes, You Can Have a Short-Barreled Rifle (SBR)

Legally Purchasing an SBR

What Is Cerakote?

Building a High-Quality SBR

Small Upgrades that Make a Big Difference