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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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  5. Noveske N4 Recon Gen 4 5.56 NATO Complete Upper - 16" Black
    Noveske N4 Recon Gen 4 5.56 NATO Complete Upper - 16" Black
    $1,496.25
    Out of stock
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  6. Noveske 3 Lug Adapter 1/2X28
    Noveske 3 Lug Adapter 1/2X28
    $71.25
    Out of stock
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  9. 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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  12. Griffin Armament EZ Brake .30Cal - 1/2x28
    Griffin Armament EZ Brake .30Cal - 1/2x28
    $79.95
    Out of stock
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Items 273-288 of 300

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  1. Thread Pitch 1/2x28 (.22 cal) Remove This Item
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Barrel Length
  1. 5.5" 1 item
  2. 6" 1 item
  3. 6.75" 1 item
  4. 7.5" 3 items
  5. 7.75" 1 item
  6. 8" 1 item
  7. 8.5" 2 items
  8. 10.3" 7 items
  9. 10.5" 26 items
  10. 11.5" 12 items
  11. 11.85" 1 item
  12. 12" 2 items
  13. 12.3" 1 item
  14. 12.5" 14 items
  15. 13" 1 item
  16. 13.7" 8 items
  17. 13.9" 5 items
  18. 14.5" 22 items
  19. 16" 41 items
  20. 16.1" 4 items
  21. 16.25" 1 item
  22. 16.3" 1 item
  23. 18" 24 items
  24. 20" 7 items
  25. 22" 2 items
Barrel Profile
  1. Dissipator 2 items
  2. Lightweight 13 items
  3. M16A1 1 item
  4. MK12 SPR 9 items
  5. Non-fluted 3 items
Caliber
  1. .22 ARC 5 items
  2. .22 LR 1 item
  3. .223/5.56 15 items
  4. .223 Rem 1 item
  5. .223 Wylde 52 items
  6. .30 Cal 6 items
  7. .308 3 items
  8. 5.56X45 1 item
  9. 5.56 NATO 135 items
  10. 5.56mm 9 items
  11. 7.62mm 3 items
  12. 9mm 3 items
Category
  1. Receiver Parts 39 items
  2. Parts & Kits 2 items
  3. Barrels 139 items
  4. Muzzle Devices 119 items
  5. MILSPEC Parts 3 items
Color
Configuration
  1. Gen 3 1 item
Finish
  1. Black 4 items
  2. Carbon Fiber 2 items
  3. Cerakote 1 item
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  5. Nitride 51 items
  6. Polished 6 items
  7. Satin 24 items
  8. Anodize 2 items
  9. Quench Polish Quench (QPQ) 2 items
Gas Block Diameter
  1. .625" 23 items
  2. .750" 130 items
  3. .875" 2 items
  4. .936" 2 items
Gas System Length
  1. Pistol 6 items
  2. Carbine 44 items
  3. Mid 75 items
  4. Intermediate 6 items
  5. Rifle 28 items
  6. Rifle +1 2 items
Height
  1. Absolute Co-Witness 2 items
Inside Diameter
  1. 1.3" 1 item
Manufacturer
  1. Advanced Armament Company (AAC) 4 items
  2. Aero Precision 1 item
  3. Aeroknox 1 item
  4. Andro Corp Industries 2 items
  5. Ballistic Advantage 16 items
  6. Blackout Defense 1 item
  7. Bootleg 1 item
  8. Boss Barrels 2 items
  9. Bravo Company MFG (BCM) 7 items
  10. Centurion Arms 4 items
  11. Christensen Arms 2 items
  12. Cross Machine Tool (CMT) 1 item
  13. Daniel Defense 7 items
  14. Dead Air Armament 3 items
  15. Faxon Firearms 21 items
  16. Ferfrans 1 item
  17. Fightlite Industries 1 item
  18. Fortis MFG 3 items
  19. Forward Controls Design 14 items
  20. Geissele 4 items
  21. Griffin Armament 6 items
  22. HERA ARMS 2 items
  23. Heresy Design 2 items
  24. HUXWRX 4 items
  25. Icon Defense 2 items
  26. JK Armament 2 items
  27. JMAC Customs 12 items
  28. Kinetic Development Group 1 item
  29. Knight’s Armament Company (KAC) 4 items
  30. Lantac 4 items
  31. Mad Pig 1 item
  32. Maxim Defense 4 items
  33. NEMO Arms 2 items
  34. Next Level Armament 2 items
  35. Noveske 28 items
  36. Precision Armament 6 items
  37. Primary Weapon Systems 7 items
  38. Q, LLC 2 items
  39. Rainier Arms, LLC 67 items
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  42. Rise Armament 1 item
  43. Sharps Bros 3 items
  44. Sig Sauer 1 item
  45. Silencerco 2 items
  46. Sons of Liberty Gun Works 19 items
  47. Spinta Precision 2 items
  48. Surefire 4 items
  49. Tactical Edge Arms 1 item
  50. Taran Tactical Innovations 1 item
  51. Torrent Suppressors 1 item
  52. V Seven Weapon Systems 2 items
  53. VKTR Industries 3 items
Mount
  1. KeyMod 1 item
  2. M-LOK 13 items
  3. Picatinny 2 items
Option
  1. AR-10 4 items
  2. AR-15 8 items
Platform
  1. AR-15 154 items
  2. Steyr Aug 2 items
Price
  1. $0.00 - $999.99 287 items
  2. $1,000.00 - $1,999.99 12 items
  3. $4,000.00 and above 1 item
Product Type
  1. 10/22 Barrel 1 item
  2. AR-15 Barrel 136 items
  3. AR-15 Complete Upper Receiver 19 items
  4. AR-15 Partial Upper Receiver 18 items
  5. AR-15 Handguard 1 item
  6. AR-15 Upper Receiver Group 1 item
  7. Compensator 28 items
  8. Crush Washer 2 items
  9. Flash Hider 32 items
  10. Muzzle Brake 50 items
  11. Muzzle Device Accessory 8 items
  12. Shim Set 2 items
  13. Steyr Aug Barrel 2 items
Rail Length
  1. 7" 1 item
  2. 9" 1 item
  3. 9.2" 1 item
  4. 9.5" 3 items
  5. 9.55" 4 items
  6. 9.75" 1 item
  7. 10" 1 item
  8. 10.5" 1 item
  9. 10.7" 2 items
  10. 11" 2 items
  11. 11.7" 2 items
  12. 11.75" 1 item
  13. 12" 2 items
  14. 12.5" 1 item
  15. 13" 1 item
  16. 13.7" 2 items
  17. 15" 13 items
  18. 15.25" 1 item
Size
  1. 3" 1 item
  2. X-Large 1 item
  3. 6" 1 item
Threaded
  1. Yes 40 items
  2. No 1 item
Twist Rate
  1. 1:7 93 items
  2. 1:7.5 12 items
  3. 1:8 55 items
  4. 1:16 1 item
Stock Status
  1. In stock 198 items
  2. Out of stock 102 items
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