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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.

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  1. Angstadt Arms 9mm AR-15 Barrel - 6"
    Angstadt Arms 9mm AR-15 Barrel - 6"
    $108.00
  2. Centurion Arms CM4 5.56 Forged Upper Receiver
    Centurion Arms CM4 5.56 Forged Upper Receiver
    $109.25
  3. WMD Guns 5.56 Accent Build Kit - FDE
    WMD Guns 5.56 Accent Build Kit - FDE
    $115.00
  4. JMAC Customs GFH 14F KeyMount Flash Hider - M14x1 LH
    JMAC Customs GFH 14F KeyMount Flash Hider - M14x1 LH
    $103.46
  5. Rise Armament LE145 Single-Stage Tactical AR-15 Trigger
    Rise Armament LE145 Single-Stage Tactical AR-15 Trigger
    $139.99
  6. Midwest Industries AK Drop-In Universal M-LOK Handguard
    Midwest Industries AK Drop-In Universal M-LOK Handguard
    $110.95
  7. WMD Guns AR15 Bolt Carrier Group - NiB-X (Black)
    WMD Guns AR15 Bolt Carrier Group - NiB-X (Black)
    $190.00
  8. Aero Precision EPC-9 Lower Receiver - FDE
    Aero Precision EPC-9 Lower Receiver - FDE
    $189.99
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