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 - 13.7"5.0 star rating 1 Review$950.00Out 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 30543 Reviews- Site Reviews
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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 rating05/12/25ZZackery M.Verified Buyer5.0 star rating05/11/25Very good productReview by Zackery M. on 11 May 2025 review stating Very good productVery good productOn Sharps Bros Showdown AR-15 Lower ReceiverRRay S.Verified Buyer5.0 star rating05/11/25Great Mags!Review by Ray S. on 11 May 2025 review stating Great Mags!Tried them today,they ran flawlessly. Hera mags have the BEST viewing window by far:you can see from the back and sides. Great German engineering!I love these mags & like to diversify my kit instead of relying on just one brand. I have MFTs,Magpuls,Lancers, and Heras!On Hera Arms H3T Polymer Magazine - 30 RoundEEddie H.Verified Buyer5.0 star rating05/11/25A++Review by Eddie H. on 11 May 2025 review stating A++Awesome lower, great price, and fast shipping.On Sharps Bros Overthrow AR-15 Stripped Lower Receiver - GEN 2RRobert P.Verified Buyer5.0 star rating05/10/25AR PurchaseReview by Robert P. on 10 May 2025 review stating AR PurchaseI am extremely happy with your service. I will certainly use you in the future.On Sig Sauer TREAD M400 2.0 5.56 NATO Rifle - 16"EErron G.Verified Buyer5.0 star rating05/09/25Awesome part and slide setup.Review by Erron G. on 9 May 2025 review stating Awesome part and slide setup.Bought slide and needed plate setup. Very happy with overall package. Fit and finish are excellent and performance is exceptional. Shipping was quick as wellOn Noveske FMRS Forward Mounted Rear Sight for DM Slide$1,567.50Out of stock -
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