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 Mountain MOD2 5.56 NATO AR-15 Barrel - 12.5"★ ReviewsPopup content startsclose Popup
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from real shoppers4.8 star rating 30457 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 rating04/15/25WWilliam G.Verified Buyer5.0 star rating04/15/25It a great lower receiverReview by William G. on 15 Apr 2025 review stating It a great lower receiverIt a great lower receiverOn Sharps Bros Hellbreaker AR-15 Lower Receiver - Gen 2AAnthony F.Verified Buyer5.0 star rating04/13/25Scorpion evo 3S1 bullpupReview by Anthony F. on 13 Apr 2025 review stating Scorpion evo 3S1 bullpupThis kit , is great, It transformed the carbine into a bullpup, with no loss of features. The weapon still remains a coolers field strip, and trigger weight still remains good. The Bullpup Kit makes the Scorpion carbine a compact maunuverable weapon, and was designed by CZ as well. Don't hesitate, you won't regret it.On CZ-USA Scorpion Evo Bullpup Kit - BlackJJason B.Verified Buyer5.0 star rating04/13/25Love this gripReview by Jason B. on 13 Apr 2025 review stating Love this gripThis handle fits perfectly and makes my firearm look even more amazing. . . Great product.On Form Rifle Chiappa Rhino Combat / Concealed Carry GripAAlowVerified Buyer5.0 star rating04/12/25Great fit on my FuseReview by Alow on 12 Apr 2025 review stating Great fit on my FuseI grabbed one of these for my fuse so I could run my shorter mags for summer. What a great grip. Fills the hand but isn't cumbersome or too weirdly shaped. It had one high point that poked me from the beavertail but about a minute and a file and its all comfortable now. Fits the 12s flush but can take any of the larger mags. It can take a x300u but fits my carry lights like the tlr7sub just fine. Highly recommend!On Mirzon Sig Sauer P365 Hybrid Polymer Grip Module - BlackDDustin P.Verified Buyer4.0 star rating04/12/25Good to goReview by Dustin P. on 12 Apr 2025 review stating Good to goAside from the guide rod plunger being stuck everything works as expected.On Shadow Systems MR920/XR920 9mm Barrel & Comp Assembly - Black$300.00 -
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- Gas Block Diameter .750" Remove This Item
- Thread Pitch 1/2x28 (.22 cal) Remove This Item
- Barrel Length 12.5" Remove This Item
- Gas System Length Mid Remove This Item
- Twist Rate 1:7 Remove This Item
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