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 PRO MK1 5.56 NATO Partial Upper Receiver5.0 star rating 1 Review$550.00 - $625.00
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Sons of Liberty Gun Works M4-EXO3 5.56 AR-15 Upper - 16"★ ReviewsPopup content startsclose Popup
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from real shoppers4.8 star rating 30569 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 rating05/20/25SSamuel G.Verified Buyer5.0 star rating05/20/25its amazing well builtReview by Samuel G. on 20 May 2025 review stating its amazing well builtBeautiful one of a kind look to my buildOn Norsso Sig Sauer P365 Reptile C Optic Ready Slide - Black DLCMMichael Z.Verified Buyer5.0 star rating05/20/25Clean lines, comfortable, just beReview by Michael Z. on 20 May 2025 review stating Clean lines, comfortable, just beClean lines, comfortable, just be sure to order a holster specifically for this frame as it is a different size then the Oem sig stuffOn Mischief Machine Commander Sig Sauer P365 Grip Module - XXLLLeopoldo 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)$712.50 -
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