Rifle Parts
Whether you're building a new rifle from scratch or looking to upgrade an existing firearm, our vast selection of rifle parts has everything you are going to need in that journey. At Rainier Arms' selection of rifle parts, you can find a wide variety of products including lower and upper parts, trigger parts, muzzle devices, and many more.
Explore our selection of high-quality parts coming from various leading manufacturers like Strike Industries, Magpul, BCM, and many more.
Also, don't forget to check our specially-made Rainier Arms barrels for your firearms.
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Ballistic Advantage Premium Series 6mm ARC AR-15 SPR Barrel - 18"★ ReviewsPopup content startsclose Popup
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from real shoppers4.8 star rating 30567 Reviews- Site Reviews
- Product Reviews
Thank you for posting a review!We value your input. Share your review so everyone else can enjoy it too.Thank you for posting a review!Your review was sent successfully and is now waiting for our staff to publish it.Verified Reviewer0.0 star rating05/20/25LLeopoldo C.Verified Buyer5.0 star rating05/19/25Great MagsReview by Leopoldo C. on 19 May 2025 review stating Great MagsI was skeptical at the beginning but the price was the main factor to purchase this first pack of ten mags. Most of my ARs mags are Magpul but these KCI are a great addition, and more orders will be placed.On KCI USA AR-15 Polymer Magazine - 30rd (10 Pack)RRonald E.Verified Buyer5.0 star rating05/19/25Perfect sizeReview by Ronald E. on 19 May 2025 review stating Perfect sizePerfect size for h&k buildOn Gear Head Works Tailhook Mod 1C Brace – BlackJJoshua H.5.0 star rating05/18/25Nice Upgrade for The Wife!Review by Joshua H. on 18 May 2025 review stating Nice Upgrade for The Wife!My wife was struggling to charge her new sig and we haven’t had time to shoot a whole lot however she wants to dry fire laser shoot so I picked this up for her. Was pretty straightforward install and it certainly helped. It’s not overly soft but enough that she had a lot less trouble. Would recommend.On DPM Systems Technologies Recoil Reduction System - Sig Sauer P365XL Spectre Comp & X-Macro (Soft Version)TTylerVerified Reviewer5.0 star rating05/18/25AmazingReview by Tyler on 18 May 2025 review stating AmazingAbsolutely amazing forearm. Did a ton of research prior to picking out the platypus but was nervous buying without shooting first. I have to say this is the best handgun I own. The trigger is amazing. Little snappy but with a light it helps. Don’t hesitate if RA has it back in stock. They sold 5 in less than 4 days this last run. Worth the $On Stealth Arms Platypus 1911 Government RMR Double Stack 9mm Pistol - BLKKKailsbert G.Verified Buyer5.0 star rating05/17/25Great companyReview by Kailsbert G. on 17 May 2025 review stating Great companyGreat companyOn Icarus Precision A.C.E 365 Fuse Macro Aluminum Grip Module$251.75Out of stock -
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- Gas Block Diameter .750" Remove This Item
- Thread Pitch 5/8x24 (.30 cal) Remove This Item
- Platform AR-15 Remove This Item
- Caliber 6mm ARC Remove This Item
- Finish Satin Remove This Item
- Barrel Profile MK12 SPR Remove This Item
- Barrel Length 18" Remove This Item
- Twist Rate 1:7 Remove This Item
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