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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Rainier Arms RUC DI 300BLK Partial Upper Receiver - 10.7"5.0 star rating 2 ReviewsSpecial Price $400.00 Regular Price $500.00Out of stock
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Noveske Stainless Lo-Pro Gas Block 300BLK AR-15 Barrel - 10.5" w/ HS Bolt★ ReviewsPopup content startsclose Popup
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from real shoppers4.8 star rating 30618 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 rating06/24/25EEdwin J.Verified Buyer5.0 star rating06/24/25Best forgripReview by Edwin J. on 24 Jun 2025 review stating Best forgripHigh recommended Buy 2On A3 Industries Aluminum Modular Vertical Foregrip w/ Integrated Hand Stop - M-LOK 2" Smooth GripEEdwin J.Verified Buyer5.0 star rating06/24/25HappyReview by Edwin J. on 24 Jun 2025 review stating Happy100% worth the money , perfect fit and the lower shipped next day will definitely buy againOn Lee Sporting Aluminum MP5 / SP5 / HK Clone Lower Housing - K Push-PinCCaseyVerified Buyer4.0 star rating06/24/25Great large frame AR optionReview by Casey on 24 Jun 2025 review stating Great large frame AR optionThe fit and finish on the receiver set is great. I’ve built on seekins, Geissele, and SiCo AR15 receiver sets, but this set is the best fitting. I would’ve given it 5 outta 5 stars, but when I built up the gun I’ve had some annoying issues with Centurion’s hand guard and their Customer Service. They are working to get issues resolved, but there has been multiple issues in a month long resolution. Not a dig on the receiver’s quality or Rainier in getting it shipped to my ffl in a timely fashion because both were solid.On Centurion Arms MK11 7.62 Ambidextrous Billet Receiver Set - BlackRRG2Verified Buyer5.0 star rating06/21/25Staccato CS W/PMM CompReview by RG2 on 21 Jun 2025 review stating Staccato CS W/PMM CompSent my CS to Staccato to add a threaded barrel with the intent of adding a comp. Decided on a PMM comp as they had one specifically for the C model. Both the the C and CS are the same at the muzzle but this was listed as not working on a CS due to the shape of the guide rod end as mentioned on another review. As the slide racks the corners of the stock guide rod would make contact with the comp hence not compatible. The DPM System not only fixed this but gave me the opportunity to dial it in. I am very pleased with this set up. It has been great with no issues and is an improvement over stock. The fit and finish are top notch!On DPM Systems Technologies Mechanical Recoil Reduction System - Staccato CS 3.5″ Bull BarrelDDavid B.Verified Buyer5.0 star rating06/20/25❤️Rainier Arms Rock !Review by David B. on 20 Jun 2025 review stating ❤️Rainier Arms Rock !Waiting list paid off ! Most other vendors would have put it on the auction site for twice as muchOn Knight's Armament Company (KAC) Barrel Extension Action Wrench$408.50Out of stock -
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