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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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  5. Geissele Airborne AR-15 Charging Handle (ACH)
    Geissele Airborne AR-15 Charging Handle (ACH)
    $105.00 - $115.00
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  7. Ballistic Advantage AR-15 Enhanced Upper Receiver
    Ballistic Advantage AR-15 Enhanced Upper Receiver
    $113.99
    Out of stock
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  8. Midwest Industries Picatinny Side Folder - Buffer Tube Adapter
    Midwest Industries Picatinny Side Folder - Buffer Tube Adapter
    $110.95
    Out of stock
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  9. Midwest Industries AK Drop-In Universal M-LOK Handguard
    Midwest Industries AK Drop-In Universal M-LOK Handguard
    $110.95
    Out of stock
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  10. Hera Arms CQR Buttstock - ODG
    Hera Arms CQR Buttstock - ODG
    $119.00
    Out of stock
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  11. Rainier Arms AR-15 Forged Mil-Spec Stripped Upper Receiver
    Rainier Arms AR-15 Forged Mil-Spec Stripped Upper Receiver
    $110.00
    Out of stock
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  12. Precision Armament - M11 Severe Duty Muzzle Brake DLC Blk .264/6.5
    Precision Armament - M11 Severe Duty Muzzle Brake DLC Blk .264/6.5
    $113.99
    Out of stock
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  13. Fortis MFG Control Shield 5.56
    Fortis MFG Control Shield 5.56
    $110.15
    Out of stock
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  14. Hera Arms Side Folding Unit (SFU)
    Hera Arms Side Folding Unit (SFU)
    $119.00
    Out of stock
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  15. Precision Armament M41 Severe-Duty Muzzle Brake DLC Blk .264/6.5
    Precision Armament M41 Severe-Duty Muzzle Brake DLC Blk .264/6.5
    $113.99
    Out of stock
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  16. Heavy Buffer CAR-10 Buffer and .308 Carbine Buffer Spring
    Heavy Buffer CAR-10 Buffer and .308 Carbine Buffer Spring
    $115.00
    Out of stock
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Barrel Length
  1. 6.75" 1 item
  2. 8.5" 1 item
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  2. 8.6 Blackout 1 item
  3. 9mm 2 items
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  1. Receiver Parts 5 items
  2. Parts & Kits 2 items
  3. Barrels 1 item
  4. Rifle Barrels 2 items
  5. Buffer Systems 2 items
  6. Trigger Parts 1 item
  7. Muzzle Devices 20 items
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  1. AR-10 / LR 308 Charging Handle 1 item
  2. AR-15 Assembled Upper Receiver 1 item
  3. AR-15 Charging Handle 2 items
  4. AR-15 Handguard 1 item
  5. AR-15 Stripped Lower Receiver 3 items
  6. AR-15 Stripped Upper Receiver 1 item
  7. Barrel 2 items
  8. Blast Shield 1 item
  9. Bolt Carrier Group 2 items
  10. Brace 1 item
  11. Buffer Kit 1 item
  12. Buffer Spring 1 item
  13. Builders Kit 1 item
  14. Charging Handle 3 items
  15. Compensator 2 items
  16. Flash Hider 1 item
  17. Handguard 6 items
  18. Lower Parts Kit 1 item
  19. Muzzle Brake 13 items
  20. Muzzle Device Accessory 3 items
  21. Pistol Grip 3 items
  22. Stock 4 items
  23. Stock Accessory 1 item
  24. Stock Adapter 1 item
  25. Trigger 1 item
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  1. 4.25" 1 item
  2. 4.5" 1 item
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  6. 11.7" 1 item
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  1. 1.125x28 1 item
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  1. Yes 5 items
Twist Rate
  1. 1:7 1 item
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  1. In stock 38 items
  2. Out of stock 17 items
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