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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. Primary Weapons Systems CQB Compensator
    Primary Weapons Systems CQB Compensator
    Out of stock
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  3. Battle Arms Development Complete Enhanced Lower Parts Kit
    Battle Arms Development Complete Enhanced Lower Parts Kit
    $125.00
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  1. Price $120.00 - $129.99 Remove This Item
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Barrel Length
  1. 10.3" 1 item
  2. 10.5" 1 item
  3. 18" 3 items
Caliber
  1. .223/5.56 1 item
  2. .223 Wylde 1 item
  3. .30 Cal 1 item
  4. .308 1 item
  5. .45 ACP 1 item
  6. 12 Gauge 1 item
  7. 5.56 NATO 5 items
  8. 5.56mm 1 item
  9. 7.62mm 2 items
  10. 7.62x39 1 item
  11. 9mm 2 items
Category
  1. Receiver Parts 7 items
  2. Parts & Kits 3 items
  3. Barrels 2 items
  4. Buffer Systems 5 items
  5. Trigger Parts 3 items
  6. Muzzle Devices 16 items
  7. Bolt Parts 3 items
  8. Grips 1 item
  9. Charging Handles 5 items
  10. Rifle Handguards 1 item
  11. Stocks & Braces 4 items
Color
Configuration
  1. AR-15 3 items
  2. Carbine 1 item
  3. Curved 2 items
  4. Flat 2 items
Finish
  1. Black 1 item
  2. Nitride 2 items
  3. Phosphate 1 item
  4. Anodize 2 items
Gas Block Diameter
  1. .750" 1 item
Gas System Length
  1. Blowback 1 item
  2. Carbine 1 item
  3. Intermediate 3 items
Manufacturer
  1. Airborne Arms 1 item
  2. B5 Systems 1 item
  3. Ballistic Advantage 1 item
  4. Battle Arms Development 2 items
  5. Bravo Company MFG (BCM) 1 item
  6. Centurion Arms 1 item
  7. Dead Air Armament 1 item
  8. Devil Dog Concepts 1 item
  9. DPM Systems Technologies 1 item
  10. F5 MFG 2 items
  11. Faxon Firearms 1 item
  12. HUXWRX 1 item
  13. Icon Defense 2 items
  14. JK Armament 1 item
  15. JMAC Customs 2 items
  16. JP Enterprises Inc 1 item
  17. Knight’s Armament Company (KAC) 2 items
  18. Krebs Customs 1 item
  19. KynSHOT 4 items
  20. Lantac 3 items
  21. Next Level Armament 1 item
  22. Noveske 2 items
  23. Primary Weapon Systems 1 item
  24. Radian Weapons 4 items
  25. Rainier Arms, LLC 1 item
  26. SCALARWORKS 1 item
  27. Sharps Bros 4 items
  28. Silencerco 1 item
  29. Sons of Liberty Gun Works 1 item
  30. Spinta Precision 1 item
  31. Stern Defense 1 item
  32. Strike Industries 1 item
  33. Triggertech 2 items
Model
  1. CZ Scorpion 1 item
Mount
  1. Picatinny 3 items
Option
  1. AR-15 10 items
  2. Front 1 item
  3. CZ 1 item
  4. Sharps Bros 1 item
Platform
  1. AR-15 6 items
  2. CZ 1 item
Product Type
  1. AR-15 Barrel 2 items
  2. AR-15 Charging Handle 4 items
  3. AR-15 Stripped Lower Receiver 4 items
  4. AR-15 Stripped Upper Receiver 2 items
  5. Bolt 1 item
  6. Bolt Carrier Group 2 items
  7. Buffer 5 items
  8. Charging Handle 1 item
  9. Compensator 1 item
  10. Flash Hider 8 items
  11. Handguard 1 item
  12. Iron Sight 1 item
  13. Lower Parts Kit 2 items
  14. Muzzle Brake 7 items
  15. Muzzle Device Accessory 1 item
  16. Parts Kit 1 item
  17. Stock 1 item
  18. Stock Accessory 1 item
  19. Stock Adapter 2 items
  20. Trigger 3 items
Rail Length
  1. 6.0" 1 item
  2. 12" 3 items
Size
  1. 9 Slot 1 item
Thread Pitch
  1. 1/2x28 (9mm) 2 items
  2. 1/2x28 (.22 cal) 13 items
  3. 5/8x24 (.30 cal) 4 items
  4. M14x1 LH 2 items
Threaded
  1. Yes 2 items
Twist Rate
  1. 1:8 1 item
  2. 1:10 1 item
Stock Status
  1. In stock 33 items
  2. Out of stock 18 items
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