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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Faxon Firearms Match Series 6.5 Grendel AR-15 Fluted Barrel - 18"4.0 star rating 3 Reviews$303.60Out of stock
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Faxon Firearms Stainless Match Series 6.5 Grendel AR-15 Barrel - 18"★ ReviewsPopup content startsclose Popup
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from real shoppers4.8 star rating 30488 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 rating04/24/25AAgustin M.Verified Buyer5.0 star rating04/23/25Well made mags!Review by Agustin M. on 23 Apr 2025 review stating Well made mags!My son in law just got his first AR15, so $ has been a factor. I found a great price on these Hera Arms magazines so we went halves, he was so excited when he got them. Thanks Rainier, we will see you again!On Hera Arms H3T Polymer Magazine - 30 Round Black (10 Pack)JJohn M.Verified Buyer5.0 star rating04/23/25Fine fit and finishReview by John M. on 23 Apr 2025 review stating Fine fit and finishInstalled on a PTR 9KT, I had to bend the ejector arm slightly to ensure it would track into the groove of the bolt carrier. Runs great with a Hoffman kit. Installed a Magpul MOE grip, the grip needed some shaving to seat flush. Very happy with this grip housing!On Lee Sporting Aluminum MP5 / SP5 / HK Clone Lower Housing - K Semi-ShelfJJustin T.Verified Buyer4.0 star rating04/23/25HappyReview by Justin T. on 23 Apr 2025 review stating HappyOnly complaint is it showed up with a dead battery. Other than that, it's crisp, easy to pick up, and seems solidly builtOn Atibal SLR-1 SOLAR RED DOT SIGHTCCarlos N.Verified Buyer5.0 star rating04/22/25Excellent much needed addition to the Sig P365 family of firearmsReview by Carlos N. on 22 Apr 2025 review stating Excellent much needed addition to the Sig P365 family of firearmsExcellent aluminum frame for my Sig P365 X. I am still in the process of building my all metal carry concealed firearm, but this was basic, providing with an excellent quality and functional part really needed. Kudos to Icarus!!!!On Icarus Precision A.C.E. 365 XL Hybrid Aluminum Grip Module - BlackBBrantley D.Verified Buyer5.0 star rating04/22/25Delta RailReview by Brantley D. on 22 Apr 2025 review stating Delta RailDespite Troy’s history of poor hiring choices, their Delta rail is still (IMO) one of the best upgrades ever made for the standard issue M4. Installation was easy with no permanent modifications necessary. The handguard is solid and has no play at all. I thought these had been discontinued, but somehow Rainier Arms found a couple. Great job on stocking and shipping!On Troy Industries Battle Rail Drop-In Delta Handguard - Carbine Gas Length$234.60Out of stock -
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