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 Receiver★ ReviewsPopup content startsclose Popup
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from real shoppers4.8 star rating 30606 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 rating06/11/25CChris A.Verified Reviewer5.0 star rating06/11/25Top 1X PrismReview by Chris A. on 11 Jun 2025 review stating Top 1X PrismFor the money you pay, you wont beat this beast. Crystal clear, large sight picture, and holds zero reeeaaalll nice. As long as you aren’t a potato, you’ll hit everything you aim at with it within 100yards, and I was constantly on steel (12in x 12in) with it at 200yards.
Lifetime warranty? Are you kidding?
Just run this, and thank me later.
Also, Rainer Arms, can’t go wrong with this great company.On Atibal P1 Solar 1x Motion Activated Micro Prism OpticKKevin A.Verified Buyer5.0 star rating06/07/25Barrel nut.Review by Kevin A. on 7 Jun 2025 review stating Barrel nut.Looks good works greatOn V Seven Weapon Systems Titanium GI Barrel NutMMic N.Verified Buyer5.0 star rating06/05/25PerfectReview by Mic N. on 5 Jun 2025 review stating PerfectBest investment for magazine made to my AROn Driven Arms Co. AR15 Standard Forged Slip Fit MagwellCCBVerified Reviewer5.0 star rating06/05/25It do be saying "compact" in the nameReview by CB on 5 Jun 2025 review stating It do be saying "compact" in the nameIf you get a compact grip and don't like that it's compact idk what to tell you lol. This grip is exactly as described and looks cool.On Driven Arms Co. Utility Compact Grip (ULCG Gen 2) - ApexRRodney S.Verified Buyer5.0 star rating06/04/25HmmReview by Rodney S. on 4 Jun 2025 review stating HmmWorks well so farOn KCI USA AR-15 Polymer Magazine - 30rd (10 Pack)$550.00 - $625.00 -
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- Gas Block Diameter .750" Remove This Item
- Thread Pitch 1/2x28 (.22 cal) Remove This Item
- Caliber 5.56 NATO Remove This Item
- Barrel Length 10.5" Remove This Item
- Mount M-LOK Remove This Item
- Rail Length 10.7" Remove This Item
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