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 Modern Series 300BLK AR-15 Barrel - 8"★ ReviewsPopup content startsclose Popup
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from real shoppers4.8 star rating 30557 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 rating05/17/25LLarry M.Verified Buyer5.0 star rating05/16/25Great product. Works as advertised.Review by Larry M. on 16 May 2025 review stating Great product. Works as advertised.Great product. Works as advertised.On KNS Precision AR15 AR/MCX Stock Adapter With FlangeCCALE J.Verified Buyer5.0 star rating05/16/25ThreadingReview by CALE J. on 16 May 2025 review stating ThreadingGreat work as always.On Cut & ThreadingCCwEastVerified Reviewer5.0 star rating05/16/25Reliable, soft shooting HD masterpieceReview by CwEast on 16 May 2025 review stating Reliable, soft shooting HD masterpieceI only have about 500 rounds through this rifle, but suppressed (HUXWERX 5. 56 Flow Ti) or unsuppressed this rifle has run flawlessly!
The rifle shoots very soft for its size, and the accuracy is good enough for a HD rifle (~ 1. 5 MOA).
It doesn’t have all the ambidextrous bells and whistles of many other manufacturers, but it’s perfect for my need, even as a south-paw shooter!
I waited too long to buy this…don’t be like me, and bite the bullet - the approval time for me was 15 days. I would buy this again 1,000 times over!!On Bravo Company MFG (BCM) CQB11 MCMR 5.56 NATO SBR - 11.5"SSunil V.Verified Buyer5.0 star rating05/15/25Great price and delivery.Review by Sunil V. on 15 May 2025 review stating Great price and delivery.Great price and delivery.On Tippmann Arms M4-22 .22LR Magazine - 25 RDRRyan O.Verified Buyer5.0 star rating05/15/25Heads up siting while wearing your NBC gear! GAS. . GAS. . GAS!! Yet still be able to protect yourselfReview by Ryan O. on 15 May 2025 review stating Heads up siting while wearing your NBC gear! GAS. . GAS. . GAS!! Yet still be able to protect yourselfRight height for heads up!On GBRS Group Lerna Optic Mount Kit - EOTech$147.25 -
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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 300 Blackout Remove This Item
- Finish Quench Polish Quench (QPQ) Remove This Item
- Barrel Length 8" Remove This Item
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