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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. Magpul STR - Storage/Type Restricted
    Magpul STR - Storage/Type Restricted
    Out of stock
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  2. Surefire PROCOMP Muzzle Brake for AR10/LR308 7.62mm
    Surefire PROCOMP Muzzle Brake for AR10/LR308 7.62mm
    $89.00
    Out of stock
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  7. Griffin Armament M4SD Hammer Comp 5.56mm
    Griffin Armament M4SD Hammer Comp 5.56mm
    $89.95
    Out of stock
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  9. Dead Air Sandman Flash Hider Front Cap - 5.56
    Dead Air Sandman Flash Hider Front Cap - 5.56
    $89.00
    Out of stock
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  10. Q LLC Bottle Rocket Enhanced Muzzle Brake
    Q LLC Bottle Rocket Enhanced Muzzle Brake
    $89.00
    Out of stock
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  13. Noveske Two Port 5.56mm Muzzle Brake - 1/2x28
    Noveske Two Port 5.56mm Muzzle Brake - 1/2x28
    $84.55
    Out of stock
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Barrel Length
  1. 7" 1 item
Caliber
  1. .22 Cal 1 item
  2. .223/5.56 3 items
  3. .30 Cal 2 items
  4. .308 2 items
  5. 5.56 NATO 3 items
  6. 5.56mm 3 items
  7. 9mm 3 items
Category
  1. Receiver Parts 2 items
  2. Parts & Kits 13 items
  3. Buffer Systems 2 items
  4. Trigger Parts 3 items
  5. Gas Systems 9 items
  6. Muzzle Devices 36 items
  7. Grips 13 items
  8. Charging Handles 8 items
  9. Stocks & Braces 9 items
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Configuration
  1. 90 Degree 1 item
  2. .625 DIA 2 items
  3. .800 DIA 1 item
  4. .936 DIA 1 item
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  1. Black 2 items
  2. Melonite 1 item
  3. Nickel Boron 1 item
  4. Anodize 6 items
Gas Block Diameter
  1. .625" 4 items
  2. .750" 6 items
  3. .875" 4 items
  4. .936" 4 items
Gas System Length
  1. Pistol 1 item
  2. Rifle 1 item
Manufacturer
  1. A3 Tactical 6 items
  2. Aero Precision 3 items
  3. ALG Defense 1 item
  4. Arms Republic 1 item
  5. Brügger & Thomet (B&T) 1 item
  6. B5 Systems 1 item
  7. Ballistic Advantage 1 item
  8. Battle Arms Development 1 item
  9. Blackout Defense 1 item
  10. Bravo Company MFG (BCM) 6 items
  11. Centurion Arms 1 item
  12. Daniel Defense 1 item
  13. Dead Air Armament 6 items
  14. Fortis MFG 3 items
  15. Forward Controls Design 8 items
  16. Geissele 3 items
  17. Grey Ghost Precision 1 item
  18. Griffin Armament 5 items
  19. JK Armament 3 items
  20. JMAC Customs 3 items
  21. Knight’s Armament Company (KAC) 1 item
  22. Magpul Industries 3 items
  23. NEMO Arms 1 item
  24. Noveske 3 items
  25. Precision Armament 2 items
  26. Primary Weapon Systems 7 items
  27. Q, LLC 1 item
  28. Rainier Arms, LLC 3 items
  29. Rainier Industries 2 items
  30. Sionics Weapon Systems 1 item
  31. Sons of Liberty Gun Works 1 item
  32. Superlative Arms 5 items
  33. Surefire 2 items
  34. Tyrant Designs 1 item
  35. V Seven Weapon Systems 2 items
  36. VLTOR 1 item
  37. WMD Guns 2 items
Mount
  1. M-LOK 7 items
  2. Picatinny 2 items
Option
  1. AR-10 1 item
  2. AR-15 8 items
  3. CZ 1 item
  4. Heckler & Koch 1 item
  5. Small Lever 2 items
  6. Large Lever 2 items
  7. Adjustable 5 items
  8. Non-Adjustable 2 items
Platform
  1. AR-15 5 items
  2. H&K 1 item
Product Type
  1. Angled Grip 2 items
  2. AR-15 Charging Handle 7 items
  3. AR-15 Stripped Lower Receiver 2 items
  4. Blast Shield 1 item
  5. Buffer 2 items
  6. Charging Handle 2 items
  7. Compensator 15 items
  8. End Cap 3 items
  9. Flash Hider 8 items
  10. Gas Block 8 items
  11. Gas Tube 1 item
  12. Lower Parts Kit 3 items
  13. Magazine Release 1 item
  14. Muzzle Brake 11 items
  15. Muzzle Device Accessory 1 item
  16. Pistol Grip 4 items
  17. Safety Selector 6 items
  18. Stock 6 items
  19. Stock Adapter 3 items
  20. Trigger 3 items
  21. Vertical Grip 8 items
Rail Length
  1. 12.6" 1 item
Size
  1. Medium 1 item
  2. Large 1 item
  3. 5 Slot 1 item
Thread Pitch
  1. 1/2x28 (9mm) 1 item
  2. 1/2x28 (.22 cal) 22 items
  3. 5/8x24 (.30 cal) 11 items
  4. M13.5x1 LH 1 item
Threaded
  1. Yes 9 items
Stock Status
  1. In stock 67 items
  2. Out of stock 28 items
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