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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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  6. Ballistic Advantage AR-15 Enhanced Lower Receiver
    Ballistic Advantage AR-15 Enhanced Lower Receiver
    $90.24
    Out of stock
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  7. Ballistic Advantage AR-15 Upper Receiver w/ Logo
    Ballistic Advantage AR-15 Upper Receiver w/ Logo
    $90.25
    Out of stock
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  10. VLTOR AR15 Charging Handle - Ambidextrous Latch
    VLTOR AR15 Charging Handle - Ambidextrous Latch
    $95.36
    Out of stock
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  11. Battle Arms Development RACK AR-10 Ambi Charging Handle
    Battle Arms Development RACK AR-10 Ambi Charging Handle
    $94.99
    Out of stock
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  14. Angstadt Arms Blastwave 3-Lug QD 9mm Blast Shield
    Angstadt Arms Blastwave 3-Lug QD 9mm Blast Shield
    $90.00
    Out of stock
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  15. WMD Guns .308 Lower Parts Kit Mod 3 - NiB-X/Nitromet
    WMD Guns .308 Lower Parts Kit Mod 3 - NiB-X/Nitromet
    $95.00
    Out of stock
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  16. Aeroknox Butterfly Brake .223/5.56
    Aeroknox Butterfly Brake .223/5.56
    $90.00
    Out of stock
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Items 65-80 of 102

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Barrel Length
  1. 5.5" 1 item
  2. 7.25" 1 item
  3. 7.5" 1 item
  4. 8" 1 item
  5. 16" 1 item
Caliber
  1. .223/5.56 2 items
  2. .223 Rem 1 item
  3. .30 Cal 2 items
  4. .308 1 item
  5. 5.56X45 1 item
  6. 5.56 NATO 2 items
  7. 5.56mm 2 items
  8. 7.62x39 1 item
  9. 8.6 Blackout 1 item
  10. 9mm 5 items
Category
  1. Receiver Parts 7 items
  2. Parts & Kits 3 items
  3. Barrels 4 items
  4. Buffer Systems 2 items
  5. Trigger Parts 6 items
  6. Gas Systems 3 items
  7. Muzzle Devices 45 items
  8. Grips 7 items
  9. Charging Handles 16 items
  10. Rifle Handguards 1 item
  11. Stocks & Braces 8 items
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Gas Block Diameter
  1. .750" 3 items
Gas System Length
  1. Blowback 2 items
  2. Pistol 1 item
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Inside Diameter
  1. 1.385" 1 item
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  1. A3 Tactical 3 items
  2. Advanced Armament Company (AAC) 1 item
  3. Aero Precision 1 item
  4. Aeroknox 2 items
  5. Airborne Arms 1 item
  6. Andro Corp Industries 1 item
  7. Angstadt Arms 2 items
  8. B5 Systems 1 item
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  10. Battle Arms Development 1 item
  11. Bootleg 1 item
  12. Bravo Company MFG (BCM) 5 items
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  15. Faxon Firearms 1 item
  16. Fortis MFG 3 items
  17. Forward Controls Design 9 items
  18. Griffin Armament 4 items
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  20. James Madison Tactical (JMT) 2 items
  21. JK Armament 3 items
  22. JL Billet 1 item
  23. JMAC Customs 6 items
  24. Kinetic Development Group 1 item
  25. Krebs Customs 1 item
  26. Mad Pig 4 items
  27. Magpul Industries 1 item
  28. NEMO Arms 1 item
  29. Next Level Armament 2 items
  30. Noveske 2 items
  31. Patriot Ordnance Factory (POF) 1 item
  32. Precision Armament 3 items
  33. Primary Weapon Systems 1 item
  34. Q, LLC 5 items
  35. R&D Precision 1 item
  36. Radian Weapons 6 items
  37. SB Tactical 4 items
  38. Silencerco 1 item
  39. Sons of Liberty Gun Works 3 items
  40. Tyrant Designs 1 item
  41. V Seven Weapon Systems 2 items
  42. VLTOR 1 item
  43. WMD Guns 3 items
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  3. AR-15 18 items
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  1. AR-15 8 items
Product Type
  1. AR-10 / LR 308 Charging Handle 1 item
  2. AR-15 Assembled Upper Receiver 1 item
  3. AR-15 Barrel 4 items
  4. AR-15 Charging Handle 10 items
  5. AR-15 Complete Lower Receiver 1 item
  6. AR-15 Handguard 1 item
  7. AR-15 Stripped Lower Receiver 2 items
  8. AR-15 Stripped Upper Receiver 3 items
  9. Blast Shield 1 item
  10. Brace 4 items
  11. Buffer Kit 1 item
  12. Buffer Tube 1 item
  13. Charging Handle 6 items
  14. Compensator 18 items
  15. Flash Hider 7 items
  16. Gas Block 3 items
  17. Lower Parts Kit 1 item
  18. Muzzle Brake 17 items
  19. Muzzle Device Accessory 2 items
  20. Pistol Grip 5 items
  21. Stock 3 items
  22. Stock Adapter 1 item
  23. Trigger 6 items
  24. Vertical Grip 2 items
Rail Length
  1. 4" 1 item
  2. 7" 1 item
  3. 9.2" 1 item
  4. 10" 1 item
  5. 11.25" 1 item
  6. 13.5" 1 item
  7. 15" 1 item
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  1. X-Large 1 item
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  1. 1/2x28 (9mm) 4 items
  2. 1/2x28 (.22 cal) 23 items
  3. 1/2x36 2 items
  4. 5/8x24 (.30 cal) 15 items
  5. 11/16x24 1 item
  6. M13.5x1 LH 1 item
  7. M14x1 LH 1 item
  8. M18x1.5 1 item
  9. M24x1.5 RH 1 item
Threaded
  1. Yes 11 items
Twist Rate
  1. 1:7 2 items
  2. 1:10 2 items
Stock Status
  1. In stock 69 items
  2. Out of stock 33 items
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