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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. Aero Precision AR15 Enhanced Carbine Buffer Kit
    Aero Precision AR15 Enhanced Carbine Buffer Kit
    $76.99
    Out of stock
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  2. Rainier Arms Exclusive Spinta Precision AR-15 9mm Thermal Barrel - 5.25” Nitride (Rainier Arms Exclusive)
    Spinta Precision AR-15 9mm Thermal Barrel - 5.25” Nitride (Rainier Arms Exclusive)
    Special Price $77.99 Regular Price $149.99
    Out of stock
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  4. JMAC Customs BDS-37 Blast Shield
    JMAC Customs BDS-37 Blast Shield
    $76.45
    Out of stock
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  6. Silencerco ASR .30 Caliber Muzzle Brake- 1/2x28
    Silencerco ASR .30 Caliber Muzzle Brake- 1/2x28
    $79.90
    Out of stock
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  9. Arms Republic Grand Power Stribog Rail Extension
    Arms Republic Grand Power Stribog Rail Extension
    $79.99
    Out of stock
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  10. Armaspec AR-15 Victory Charging Handle - Black
    Armaspec AR-15 Victory Charging Handle - Black
    $71.99
    Out of stock
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  12. Griffin Armament EZ Brake .30Cal - 1/2x28
    Griffin Armament EZ Brake .30Cal - 1/2x28
    $79.95
    Out of stock
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  13. A3 Tactical Angled Foregrip - IWI Uzi Pro w/ M-Lok
    A3 Tactical Angled Foregrip - IWI Uzi Pro w/ M-Lok
    $75.95
    Out of stock
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  15. Faxon Firearms 458 Socom/450 Bushmaster Bolt - Nitride
    Faxon Firearms 458 Socom/450 Bushmaster Bolt - Nitride
    $78.19
    Out of stock
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  16. Griffin Armament EZ Brake .30 - 5/8x24
    Griffin Armament EZ Brake .30 - 5/8x24
    $79.95
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Items 1-16 of 39

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  1. Price $70.00 - $79.99 Remove This Item
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Barrel Length
  1. 5.25" 1 item
  2. 18" 1 item
Caliber
  1. .223/5.56 1 item
  2. .30 Cal 3 items
  3. .338 1 item
  4. .458 Socom 1 item
  5. 300 Blackout 1 item
  6. 5.56 NATO 1 item
  7. 9mm 4 items
Category
  1. Parts & Kits 7 items
  2. Barrels 1 item
  3. Buffer Systems 2 items
  4. Gas Systems 4 items
  5. Muzzle Devices 16 items
  6. Bolt Parts 1 item
  7. Grips 3 items
  8. Charging Handles 3 items
  9. Rifle Handguards 1 item
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  1. AR-15 1 item
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  2. Quench Polish Quench (QPQ) 1 item
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  1. .625" 1 item
  2. .750" 2 items
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  1. Blowback 1 item
  2. Intermediate 1 item
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  2. Advanced Armament Company (AAC) 1 item
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  7. Cross Machine Tool (CMT) 1 item
  8. Daniel Defense 1 item
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  11. Griffin Armament 4 items
  12. JK Armament 1 item
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  14. JP Enterprises Inc 2 items
  15. Kinetic Development Group 2 items
  16. Noveske 1 item
  17. Silencerco 5 items
  18. Spinta Precision 1 item
  19. Taran Tactical Innovations 1 item
  20. True North Concepts 1 item
  21. V Seven Weapon Systems 3 items
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  1. AR-15 3 items
  2. SRS-C 3.3 oz. 1 item
  3. SRS-H 3.8 oz. 1 item
  4. SRS-H2 4.7 oz. 1 item
  5. SRS-H3 5.6 oz. 1 item
  6. SRS-BB 5.7 oz. 1 item
  7. SRS-9mm 6.4 oz. 1 item
  8. SRS-AR10 5.7 oz. 1 item
  9. Adjustable 4 items
Platform
  1. AR-15 1 item
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  1. Angled Grip 1 item
  2. AR-15 Barrel 1 item
  3. AR-15 Charging Handle 3 items
  4. Barrel Nut 1 item
  5. Bolt 1 item
  6. Buffer Kit 1 item
  7. Castle Nut / End Plate 1 item
  8. Compensator 1 item
  9. End Cap 1 item
  10. Flash Hider 1 item
  11. Front Sight 1 item
  12. Gas Block 4 items
  13. Handguard 1 item
  14. Muzzle Brake 11 items
  15. Muzzle Device Accessory 3 items
  16. Recoil Spring 1 item
  17. Safety Selector 4 items
  18. Vertical Grip 2 items
Rail Length
  1. 12" 2 items
Thread Pitch
  1. 1.375-24 1 item
  2. 1/2x28 (9mm) 2 items
  3. 1/2x28 (.22 cal) 8 items
  4. 5/8x24 (.30 cal) 3 items
  5. 5/8x32 1 item
Threaded
  1. Yes 1 item
Twist Rate
  1. 1:10 1 item
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  1. Out of stock 39 items Remove This Item
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