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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. Bravo Company MFG (BCM) Raider M10 M-LOK Handguard - 10"
    Bravo Company MFG (BCM) Raider M10 M-LOK Handguard - 10"
    $239.00
    Out of stock
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  2. Radian Weapons Vertex Trigger - Flat Bow
    Radian Weapons Vertex Trigger - Flat Bow
    $229.95
    Out of stock
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  3. Centurion Arms V2 5.56 Chrome Bolt
    Centurion Arms V2 5.56 Chrome Bolt
    $118.75
    Out of stock
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  4. Centurion Arms Hard Chrome Bolt Carrier Group w/ V2 Bolt
    Centurion Arms Hard Chrome Bolt Carrier Group w/ V2 Bolt
    $308.75
    Out of stock
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Items 417-423 of 423

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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" 2 items
  6. 5.5" 2 items
  7. 6" 7 items
  8. 6.5" 3 items
  9. 6.75" 1 item
  10. 7.25" 1 item
  11. 7.5" 5 items
  12. 7.75" 1 item
  13. 8" 6 items
  14. 8.3" 2 items
  15. 8.5" 7 items
  16. 9" 2 items
  17. 10" 3 items
  18. 10.3" 4 items
  19. 10.5" 34 items
  20. 10.7" 4 items
  21. 11.5" 11 items
  22. 12" 7 items
  23. 12.3" 1 item
  24. 12.5" 17 items
  25. 13.7" 9 items
  26. 13.9" 4 items
  27. 14.5" 26 items
  28. 16" 64 items
  29. 16.1" 3 items
  30. 18" 36 items
  31. 20" 12 items
  32. 22" 6 items
Barrel Profile
  1. Dissipator 2 items
  2. DMR 2 items
  3. Lightweight 13 items
  4. M16A1 1 item
  5. MK12 SPR 13 items
Caliber
  1. .22 ARC 5 items
  2. .223/5.56 1 item
  3. .223 Wylde 49 items
  4. .458 Socom 2 items
  5. 300 Blackout 34 items
  6. 350 Legend 2 items
  7. 5.56X45 7 items
  8. 5.56 NATO 114 items
  9. 5.56mm 4 items
  10. 6mm ARC 24 items
  11. 6.5 Grendel 14 items
  12. 7.62x39 2 items
  13. 9mm 35 items
Category
  1. Receiver Parts 68 items
  2. Parts & Kits 19 items
  3. Barrels 255 items
  4. Buffer Systems 4 items
  5. Trigger Parts 13 items
  6. Muzzle Devices 3 items
  7. Bolt Parts 12 items
  8. Grips 6 items
  9. Charging Handles 12 items
  10. Rifle Handguards 24 items
  11. Stocks & Braces 7 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 4 items
  4. Melonite 1 item
  5. NiB-X 1 item
  6. Nitride 84 items
  7. Nitromet 1 item
  8. Phosphate 1 item
  9. Polished 19 items
  10. Satin 52 items
  11. Anodize 6 items
  12. Quench Polish Quench (QPQ) 2 items
Gas Block Diameter
  1. .625" 26 items
  2. .750" 181 items
  3. .875" 10 items
  4. .936" 2 items
Gas System Length
  1. Blowback 33 items
  2. Pistol -1 1 item
  3. Pistol 37 items
  4. Carbine 42 items
  5. Mid 86 items
  6. Intermediate 8 items
  7. Rifle 42 items
  8. Rifle +1 5 items
  9. Rifle +2 4 items
Inside Diameter
  1. 1.15" 1 item
  2. 1.3" 2 items
  3. 1.315" 1 item
Manufacturer
  1. A3 Tactical 2 items
  2. Aero Precision 8 items
  3. Andro Corp Industries 2 items
  4. Angstadt Arms 1 item
  5. Armaspec 1 item
  6. B5 Systems 1 item
  7. Ballistic Advantage 29 items
  8. Battle Arms Development 3 items
  9. Blackout Defense 1 item
  10. Boss Barrels 9 items
  11. Bravo Company MFG (BCM) 19 items
  12. Centurion Arms 9 items
  13. Christensen Arms 2 items
  14. Cross Machine Tool (CMT) 2 items
  15. Daniel Defense 7 items
  16. DPM Systems Technologies 1 item
  17. Driven Arms Co. 2 items
  18. Eartune 1 item
  19. Emissary Development 1 item
  20. Ergo Grips 1 item
  21. Faxon Firearms 41 items
  22. Fortis MFG 2 items
  23. Forward Controls Design 10 items
  24. Geissele 9 items
  25. Icon Defense 1 item
  26. Knight’s Armament Company (KAC) 2 items
  27. Kaw Valley Precision 1 item
  28. Lantac 1 item
  29. Lewis Machine & Tool (LMT) 18 items
  30. Magpul Industries 1 item
  31. Maxim Defense 8 items
  32. Mission First Tactical 1 item
  33. NEMO Arms 2 items
  34. Next Level Armament 5 items
  35. Noveske 30 items
  36. Obsidian Arms 1 item
  37. Patriot Ordnance Factory (POF) 1 item
  38. Q, LLC 3 items
  39. R&D Precision 1 item
  40. Radian Weapons 2 items
  41. Rainier Arms, LLC 122 items
  42. Reptilia Corp 1 item
  43. Rise Armament 9 items
  44. ROAM Rifles 4 items
  45. Sharps Bros 3 items
  46. Shooting Innovations 2 items
  47. Sons of Liberty Gun Works 22 items
  48. Spinta Precision 5 items
  49. Taran Tactical Innovations 1 item
  50. Triggertech 2 items
  51. V Seven Weapon Systems 3 items
  52. VKTR Industries 5 items
  53. WMD Guns 1 item
Mount
  1. M-LOK 37 items
  2. Picatinny 5 items
Option
  1. AR-15 16 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
Price
  1. $0.00 - $999.99 414 items
  2. $1,000.00 - $1,999.99 6 items
  3. $2,000.00 and above 3 items
Product Type
  1. Accessory 1 item
  2. AR-15 Barrel 255 items
  3. AR-15 Charging Handle 10 items
  4. AR-15 Complete Lower Receiver 15 items
  5. AR-15 Complete Upper Receiver 10 items
  6. AR-15 Partial Upper Receiver 20 items
  7. AR-15 Handguard 25 items
  8. AR-15 Receiver Set 4 items
  9. AR-15 Stripped Lower Receiver 12 items
  10. AR-15 Stripped Upper Receiver 4 items
  11. AR-15 Upper Receiver Group 1 item
  12. Bolt 2 items
  13. Bolt Carrier Group 9 items
  14. Bolt Catch 4 items
  15. Brace 1 item
  16. Buffer 1 item
  17. Buffer Spring 1 item
  18. Buffer Tube 2 items
  19. Charging Handle 5 items
  20. Compensator 3 items
  21. Complete Upper 1 item
  22. Dust Cover 3 items
  23. Firing Pin 1 item
  24. Handguard 2 items
  25. Magazine Catch 1 item
  26. Parts Kit 1 item
  27. Pistol Grip 6 items
  28. Port Door 1 item
  29. Safety Selector 3 items
  30. Stock 5 items
  31. Stock Accessory 1 item
  32. Take Down / Pivot Pins 6 items
  33. Trigger 11 items
  34. Trigger Guard 2 items
Rail Length
  1. 7" 6 items
  2. 7.2" 2 items
  3. 9" 3 items
  4. 9.15" 1 item
  5. 9.25" 1 item
  6. 9.5" 6 items
  7. 9.55" 3 items
  8. 9.75" 1 item
  9. 10" 2 items
  10. 10.3" 1 item
  11. 10.5" 3 items
  12. 10.7" 1 item
  13. 11.1" 1 item
  14. 11.5" 4 items
  15. 11.7" 2 items
  16. 12" 3 items
  17. 12.5" 4 items
  18. 13" 6 items
  19. 13.25" 1 item
  20. 13.5" 2 items
  21. 13.7" 2 items
  22. 15" 15 items
  23. 15.25" 1 item
Size
  1. Medium 1 item
  2. Large 1 item
Thread Pitch
  1. 1/2x28 (9mm) 30 items
  2. 1/2x28 (.22 cal) 153 items
  3. 1/2x36 3 items
  4. 5/8x24 (.30 cal) 75 items
  5. 11/16x24 2 items
Threaded
  1. Yes 13 items
  2. No 1 item
Twist Rate
  1. 1:5 2 items
  2. 1:7 125 items
  3. 1:7.5 26 items
  4. 1:8 82 items
  5. 1:10 37 items
  6. 1:14 2 items
Stock Status
  1. In stock 286 items
  2. Out of stock 137 items
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