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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. Battle Arms Development Lightweight Billet Upper Receiver
    Battle Arms Development Lightweight Billet Upper Receiver
    $239.00
    Out of stock
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  2. Magpul Ladder Style Rail Protector
    Magpul Ladder Style Rail Protector
    Out of stock
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  3. Rainier Arms AR-15 M-LOK SWITCH .223/5.56 Rail
    Rainier Arms AR-15 M-LOK SWITCH .223/5.56 Rail
    Out of stock
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  4. Cross Machine Tool (CMT) Tactical UHPR MOD 2 HANDGUARD AR-15 (M-LOK)
    Cross Machine Tool (CMT) Tactical UHPR MOD 2 HANDGUARD AR-15 (M-LOK)
    Out of stock
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  5. Aero Precision AR15 STRIPPED LOWER RECEIVER GEN 2 - BLACK
    Aero Precision AR15 STRIPPED LOWER RECEIVER GEN 2 - BLACK
    $119.99
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  6. Hera Arms AR15 Grip
    Hera Arms AR15 Grip
    Out of stock
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  7. Bravo Company MFG (BCM) GUNFIGHTER Ambidextrous Charging Handle 556 Mod 3X3 (Large Latch)
    Bravo Company MFG (BCM) GUNFIGHTER Ambidextrous Charging Handle 556 Mod 3X3 (Large Latch)
    $89.95
    Out of stock
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  8. Armaspec Gun Builder's Lower Parts Kit - Black
    Armaspec Gun Builder's Lower Parts Kit - Black
    $67.49
    Out of stock
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  9. BATTLE ARMS Development AR-15 RIGIDRAIL M-LOK HANDGUARD
    BATTLE ARMS Development AR-15 RIGIDRAIL M-LOK HANDGUARD
    Out of stock
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  10. Lantac N15 Raven Billet Receiver Set
    Lantac N15 Raven Billet Receiver Set
    $458.99
    Out of stock
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  11. Lantac SF15 USR FORGED UPPER & LOWER SET
    Lantac SF15 USR FORGED UPPER & LOWER SET
    $305.98
    Out of stock
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  12. Radian Weapons AR-15 Raptor LT Ambidextrous Charging Handle - Black
    Radian Weapons AR-15 Raptor LT Ambidextrous Charging Handle - Black
    $74.95
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  13. Aero Precision AR-15 M4E1 Stripped Lower Receiver - Black
    Aero Precision AR-15 M4E1 Stripped Lower Receiver - Black
    $139.99
    Out of stock
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  14. Faxon Firearms Stripped Forged Upper Receiver - 7075-T6
    Faxon Firearms Stripped Forged Upper Receiver - 7075-T6
    $91.99
    Out of stock
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  15. Hera Arms HUS AR-15 Billet Upper Receivers
    Hera Arms HUS AR-15 Billet Upper Receivers
    $139.00
    Out of stock
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  16. Aero Precision AR15 Stripped Upper Receiver Black Anodized
    Aero Precision AR15 Stripped Upper Receiver Black Anodized
    $104.99
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Barrel Length
  1. 16" 5 items
  2. 18" 6 items
Caliber
  1. .223/5.56 1 item
  2. .45 ACP 1 item
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  4. 7.62x51 1 item
Category
  1. Receiver Parts 40 items
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  7. $600.00 and above 1 item
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  1. Anti Walk Pins 2 items
  2. AR-10 Handguard 1 item
  3. AR-15 Assembled Upper Receiver 2 items
  4. AR-15 Charging Handle 8 items
  5. AR-15 Complete Lower Receiver 8 items
  6. AR-15 Partial Upper Receiver 1 item
  7. AR-15 Handguard 21 items
  8. AR-15 Receiver Set 3 items
  9. AR-15 Stripped Lower Receiver 10 items
  10. AR-15 Stripped Upper Receiver 12 items
  11. Barrel 1 item
  12. Bolt 1 item
  13. Bolt Carrier Group 8 items
  14. Buffer Kit 2 items
  15. Buffer Tube 1 item
  16. Builders Kit 1 item
  17. Flash Hider 1 item
  18. Forearm Accesory 1 item
  19. Grip Module 1 item
  20. Handguard 3 items
  21. Lower Parts Kit 5 items
  22. Muzzle Brake 1 item
  23. Patch 1 item
  24. Safety Selector 1 item
  25. Silent Captured Spring 1 item
  26. Take Down / Pivot Pins 2 items
  27. Trigger 4 items
  28. Trigger Guard 1 item
  29. Upper Parts Kit 1 item
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  23. 17" 1 item
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