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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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  4. Geissele Super Stabby Bayonet Mount
    Geissele Super Stabby Bayonet Mount
    $150.00 - $165.00
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  5. Aero Precision M5 .308 Stripped Upper Receiver
    Aero Precision M5 .308 Stripped Upper Receiver
    $169.99 - $189.99
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  10. Midwest Industries Enhanced AR-15 Single Stage Trigger w/ Anti-Walk Pins - 3.5lbs
    Midwest Industries Enhanced AR-15 Single Stage Trigger w/ Anti-Walk Pins - 3.5lbs
    $167.95
    Out of stock
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  11. Ballistic Advantage Modern Series 5.56 Government Profile Midlength AR 15 Barrel - 14.5"
    Ballistic Advantage Modern Series 5.56 Government Profile Midlength AR 15 Barrel - 14.5"
    $161.50
    Out of stock
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  12. Midwest Industries Slim Line AR-15 M-Lok Handguard - 10.5"
    Midwest Industries Slim Line AR-15 M-Lok Handguard - 10.5"
    $162.95
    Out of stock
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  13. Midwest Industries Extended AK47/74 Universal Handguard W/ Standard Topcover
    Midwest Industries Extended AK47/74 Universal Handguard W/ Standard Topcover
    $162.95
    Out of stock
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  14. Aero Precision EPC-9 Lower Receiver - Black
    Aero Precision EPC-9 Lower Receiver - Black
    $169.99
    Out of stock
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  15. Faxon Firearms AR-15 G3 STREAMLINE Aluminum M-LOK Handguard - 13"
    Faxon Firearms AR-15 G3 STREAMLINE Aluminum M-LOK Handguard - 13"
    $165.60
    Out of stock
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  16. Rainier Arms 9MM Glock/Colt Compatible Precision Match Grade Bolt Carrier Group (BCG) - Nickel Boron
    Rainier Arms 9MM Glock/Colt Compatible Precision Match Grade Bolt Carrier Group (BCG) - Nickel Boron
    $165.00
    Out of stock
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Barrel Length
  1. 13.7" 1 item
  2. 14.5" 1 item
  3. 16" 4 items
  4. 20" 1 item
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  1. Receiver Parts 3 items
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  1. AR-10 Stripped Upper Receiver 1 item
  2. AR-15 Handguard 10 items
  3. AR-15 Stripped Lower Receiver 1 item
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  5. Barrel 6 items
  6. Bolt Carrier Group 7 items
  7. Brace 2 items
  8. Buffer Spring 1 item
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  12. Muzzle Brake 1 item
  13. Stock 2 items
  14. Trigger 1 item
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  1. 6.0" 1 item
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  3. 6.75" 2 items
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