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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Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"5.0 star rating 2 Reviews$855.00Out of stock
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Noveske N4 Infidel CHF 5.56 NATO Complete Upper Receiver Group - 13.7"★ ReviewsPopup content startsclose Popup
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from real shoppers4.8 star rating 30563 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 rating05/19/25TTylerVerified 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 ModuleBBrianVerified Buyer5.0 star rating05/17/25KCI 20rd magazine for mp5 seriesReview by Brian on 17 May 2025 review stating KCI 20rd magazine for mp5 seriesI wanted 20rd mags for my mp5k and the other brands had to be shaved down in order to feed properly. These KCI mags worked just fine right out of the package! Will not hesitate to buy more in the future!On KCI USA H&K MP5 MAGAZINE - 20 RDPPhatpastorVerified Buyer5.0 star rating05/17/25I love it…fit, finish, and flash!Review by Phatpastor on 17 May 2025 review stating I love it…fit, finish, and flash!This was the perfect addition to my AR pistol. Does exactly what I hoped for!On Rainier Arms Mini Compensator - RMC 2.0 BlackJJoe E.Verified Buyer5.0 star rating05/17/25Great product, exactly what IReview by Joe E. on 17 May 2025 review stating Great product, exactly what IGreat product, exactly what I wantedOn Drew Meyer Defense Mod 1 Chopstop M-LOK Handstop$1,567.50Out of stock -
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