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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Rainier Arms RUC DI 5.56 NATO Partial Upper Receiver★ ReviewsPopup content startsclose Popup
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from real shoppers4.8 star rating 30598 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 rating06/02/25JJoseph D.Verified Buyer5.0 star rating06/01/25Dangerous GoodsReview by Joseph D. on 1 Jun 2025 review stating Dangerous GoodsExcellent reading periodical. The “moral patch” was a cool bonus too!On UN12 Magazine - Issue 3KKevin A.Verified Buyer5.0 star rating06/01/25Gas tube.Review by Kevin A. on 1 Jun 2025 review stating Gas tube.Works perfect as it should.On Gas Tube - Black NitrideMMavisVerified Reviewer5.0 star rating05/31/25Best 1-10x on the marketReview by Mavis on 31 May 2025 review stating Best 1-10x on the marketThe 1-10x is by far the best from what I've seen and tried. Bunch of 1-10x's out there in SFP and not very many affordable options in FFP. The specs are far better than any other at this price range or even the more expensive Razor 1-10x. From my research it has the largest tube size and objective lens size makes it for a very forgiving eye box and exit pupil woth Japanese glass. The eye relief on this is insane. I measured up to 8" on 1x and the illumination is probably the brightest. Now here comes some cons and really just nkit picking. The magnification dial is stiff maybe it will loosen over time. The brightness probably needs a couple more settings for low light as lowest setting is still too bright. Overall, winner for the price and specs.On Atibal X 1-10x30 FFP XV2 Reticle RiflescopeFFrancisco O.Verified Buyer5.0 star rating05/31/25Great ProductReview by Francisco O. on 31 May 2025 review stating Great ProductBought 1st one for my Ar15 pistol built and loved it, so much that I have 3 now, great product redirects muzzle blast infront of you. . . . .On Next Level Armament NLX-25 .223/5.56 Linear CompensatorJJerryVerified Reviewer5.0 star rating05/31/25good shape and comfortReview by Jerry on 31 May 2025 review stating good shape and comfortI know it's definitely personal preference, but I love this product. This is the only one that doesn't bother my middle finger. Good deep undercut keeps trigger guard away from my fingers. Resting spot is a great indicator for me how to form grip for best shooting comfort. Shape is a little edgy, but polymer is easy to be rounded with sand paper.On Strike Industries PolyFlex Trigger Guard with Finger Rest$400.00 - $480.00 -
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- Gas Block Diameter .750" Remove This Item
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