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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.

Ballistic Advantage Premium Series Hanson .223 Wylde Lo-Pro Gas Block AR-15 Barrel - 16"
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Verified Reviewer

0.0 star rating

07/14/25

Review by Anonymous User

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07/14/25

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Jeff S.
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5.0 star rating

07/14/25

great grip

Review by Jeff S. on 14 Jul 2025 review stating great grip
Great grip

On Bravo Company MFG (BCM) GUNFIGHTER Grip Mod 0

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07/14/25

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Jeff S.
Verified Buyer

5.0 star rating

07/14/25

Compact grip that doesn't feel compact, fit large hands just fine.

Review by Jeff S. on 14 Jul 2025 review stating Compact grip that doesn't feel compact, fit large hands just fine.
Compact grip that doesn't feel compact, fit large hands fine. Used on a compact build, the grip worked perfect for the application.

On B5 Systems P-Grip 22K Pistol Grip

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07/14/25

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Sean R.
Verified Buyer

5.0 star rating

07/12/25

Love it, perfect quality, looks

Review by Sean R. on 12 Jul 2025 review stating Love it, perfect quality, looks
Love it, perfect quality, looks awesome!

On Norsso Reptile XP RMR Slide For Glock 19 Gen 5 - Black DLC

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07/12/25

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Adam U.
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1.0 star rating

07/11/25

Defective JMAC Threaded Mount – Manufacturing Flaw on First Thread

Review by Adam U. on 11 Jul 2025 review stating Defective JMAC Threaded Mount – Manufacturing Flaw on First Thread
I recently purchased a brand-new JMAC mount from Rainier Arms and ran into a serious issue straight out of the package. When attempting to thread my Resilient RS9 suppressor onto the mount, I immediately noticed significant resistance. My first concern was potential cross-threading or an incorrect thread spec, but after double-checking compatibility and verifying that the threads were properly aligned, the problem persisted.

Upon closer inspection with a pick, I discovered that the resistance was coming from the very first thread. There's a small but clearly visible dent or deformity in that area—deep enough that even after a careful attempt to smooth it out, the defect remains. This is not a burr or damage from improper handling; the mount was installed using proper tools, and the threads were never touched until I attempted to mount the suppressor.

Frankly, I’m extremely disappointed. For a premium product at this price point, JMAC’s quality control should be far better. This kind of defect should never make it out the door.

I’ve reached out to JMAC directly and hope they will stand behind their product and provide a timely resolution—ideally a replacement. I doubt Rainier Arms will assist, as they're just the dealer, but I expect JMAC to take responsibility.

On JMAC Customs 360HD 1/2-28 FaceMount HUB

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07/11/25

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Justin S.
Verified Buyer

5.0 star rating

07/09/25

UN Finally does something right

Review by Justin S. on 9 Jul 2025 review stating UN Finally does something right
Super nice format and layout, great products, good info!

On UN12 Magazine - Issue 18

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07/09/25

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