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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. Platform AR-15 Remove This Item
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Barrel Length
  1. 3.1" 1 item
  2. 4" 4 items
  3. 4.5" 2 items
  4. 5" 3 items
  5. 5.25" 1 item
  6. 5.5" 1 item
  7. 6" 5 items
  8. 6.5" 2 items
  9. 6.75" 1 item
  10. 7.25" 1 item
  11. 7.5" 3 items
  12. 7.75" 1 item
  13. 8" 5 items
  14. 8.3" 1 item
  15. 8.5" 5 items
  16. 9" 1 item
  17. 10" 3 items
  18. 10.3" 3 items
  19. 10.5" 23 items
  20. 10.7" 4 items
  21. 11.5" 7 items
  22. 12" 4 items
  23. 12.3" 1 item
  24. 12.5" 11 items
  25. 13.7" 6 items
  26. 13.9" 3 items
  27. 14.5" 20 items
  28. 16" 43 items
  29. 16.1" 2 items
  30. 18" 23 items
  31. 20" 6 items
  32. 22" 4 items
Barrel Profile
  1. Lightweight 13 items
  2. M16A1 1 item
  3. MK12 SPR 7 items
Caliber
  1. .22 ARC 1 item
  2. .223/5.56 1 item
  3. .223 Wylde 36 items
  4. .458 Socom 1 item
  5. 300 Blackout 24 items
  6. 350 Legend 2 items
  7. 5.56X45 3 items
  8. 5.56 NATO 70 items
  9. 5.56mm 3 items
  10. 6mm ARC 19 items
  11. 6.5 Grendel 13 items
  12. 7.62x39 2 items
  13. 9mm 26 items
Category
  1. Receiver Parts 34 items
  2. Parts & Kits 15 items
  3. Barrels 180 items
  4. Buffer Systems 3 items
  5. Trigger Parts 9 items
  6. Muzzle Devices 2 items
  7. Bolt Parts 6 items
  8. Grips 4 items
  9. Charging Handles 9 items
  10. Rifle Handguards 18 items
  11. Stocks & Braces 6 items
  12. MILSPEC Parts 1 item
Color
Configuration
  1. 90 Degree 1 item
  2. Curved 5 items
  3. Flat 4 items
Finish
  1. Black 1 item
  2. Carbon Fiber 2 items
  3. Cerakote 1 item
  4. NiB-X 1 item
  5. Nitride 61 items
  6. Nitromet 1 item
  7. Polished 16 items
  8. Satin 41 items
  9. Anodize 3 items
  10. Quench Polish Quench (QPQ) 1 item
Gas Block Diameter
  1. .625" 21 items
  2. .750" 123 items
  3. .875" 7 items
  4. .936" 2 items
Gas System Length
  1. Blowback 25 items
  2. Pistol -1 1 item
  3. Pistol 30 items
  4. Carbine 26 items
  5. Mid 65 items
  6. Intermediate 4 items
  7. Rifle 27 items
  8. Rifle +1 3 items
  9. Rifle +2 4 items
Inside Diameter
  1. 1.15" 1 item
  2. 1.3" 1 item
Manufacturer
  1. A3 Tactical 1 item
  2. Aero Precision 1 item
  3. Andro Corp Industries 2 items
  4. Armaspec 1 item
  5. B5 Systems 1 item
  6. Ballistic Advantage 12 items
  7. Battle Arms Development 1 item
  8. Boss Barrels 9 items
  9. Bravo Company MFG (BCM) 5 items
  10. Centurion Arms 5 items
  11. Christensen Arms 2 items
  12. Cross Machine Tool (CMT) 1 item
  13. Daniel Defense 5 items
  14. DPM Systems Technologies 1 item
  15. Driven Arms Co. 2 items
  16. Eartune 1 item
  17. Emissary Development 1 item
  18. Faxon Firearms 23 items
  19. Fortis MFG 2 items
  20. Forward Controls Design 10 items
  21. Geissele 6 items
  22. Icon Defense 1 item
  23. Knight’s Armament Company (KAC) 1 item
  24. Kaw Valley Precision 1 item
  25. Lantac 1 item
  26. Lewis Machine & Tool (LMT) 10 items
  27. Magpul Industries 1 item
  28. Maxim Defense 8 items
  29. Mission First Tactical 1 item
  30. NEMO Arms 1 item
  31. Next Level Armament 3 items
  32. Noveske 17 items
  33. Patriot Ordnance Factory (POF) 1 item
  34. Q, LLC 1 item
  35. R&D Precision 1 item
  36. Radian Weapons 1 item
  37. Rainier Arms, LLC 103 items
  38. Reptilia Corp 1 item
  39. Rise Armament 9 items
  40. ROAM Rifles 4 items
  41. Sharps Bros 2 items
  42. Shooting Innovations 2 items
  43. Sons of Liberty Gun Works 16 items
  44. Spinta Precision 2 items
  45. Triggertech 2 items
  46. V Seven Weapon Systems 2 items
  47. WMD Guns 1 item
Mount
  1. M-LOK 24 items
  2. Picatinny 3 items
Option
  1. AR-15 11 items
  2. JP Silent Captured Spring - Standard 1 item
  3. JP Silent Captured Spring - Heavy 1 item
  4. JP Silent Captured Spring - 9mm 1 item
  5. Buffer & Spring - Standard 3 items
  6. Buffer & Spring - 9mm 2 items
  7. Buffer & Spring - H1 3 items
  8. Buffer & Spring - H2 2 items
  9. Buffer & Spring - H3 2 items
Product Type
  1. Accessory 1 item
  2. AR-15 Barrel 180 items
  3. AR-15 Charging Handle 8 items
  4. AR-15 Complete Lower Receiver 5 items
  5. AR-15 Complete Upper Receiver 6 items
  6. AR-15 Partial Upper Receiver 11 items
  7. AR-15 Handguard 19 items
  8. AR-15 Receiver Set 2 items
  9. AR-15 Stripped Lower Receiver 6 items
  10. AR-15 Stripped Upper Receiver 2 items
  11. Bolt 1 item
  12. Bolt Carrier Group 5 items
  13. Bolt Catch 3 items
  14. Brace 1 item
  15. Buffer 1 item
  16. Buffer Tube 2 items
  17. Charging Handle 3 items
  18. Compensator 2 items
  19. Complete Upper 1 item
  20. Dust Cover 3 items
  21. Handguard 2 items
  22. Parts Kit 1 item
  23. Pistol Grip 4 items
  24. Port Door 1 item
  25. Safety Selector 2 items
  26. Stock 4 items
  27. Stock Accessory 1 item
  28. Take Down / Pivot Pins 5 items
  29. Trigger 7 items
  30. Trigger Guard 2 items
Rail Length
  1. 7" 4 items
  2. 7.2" 1 item
  3. 9" 2 items
  4. 9.15" 1 item
  5. 9.25" 1 item
  6. 9.5" 5 items
  7. 9.55" 3 items
  8. 10" 1 item
  9. 10.3" 1 item
  10. 10.5" 2 items
  11. 10.7" 1 item
  12. 11.1" 1 item
  13. 11.5" 2 items
  14. 11.7" 1 item
  15. 12" 2 items
  16. 12.5" 3 items
  17. 13" 4 items
  18. 13.25" 1 item
  19. 13.5" 1 item
  20. 13.7" 1 item
  21. 15" 10 items
  22. 15.25" 1 item
Size
  1. Medium 1 item
  2. Large 1 item
Thread Pitch
  1. 1/2x28 (9mm) 23 items
  2. 1/2x28 (.22 cal) 99 items
  3. 1/2x36 2 items
  4. 5/8x24 (.30 cal) 60 items
  5. 11/16x24 1 item
Threaded
  1. Yes 7 items
Twist Rate
  1. 1:7 73 items
  2. 1:7.5 21 items
  3. 1:8 66 items
  4. 1:10 28 items
  5. 1:14 1 item
Stock Status
  1. In stock 286 items Remove This Item
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