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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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Barrel Length
  1. 5" 1 item
  2. 5.5" 2 items
  3. 7.5" 2 items
  4. 8" 1 item
  5. 8.5" 1 item
  6. 10.3" 4 items
  7. 10.5" 3 items
  8. 11.5" 1 item
  9. 12.5" 1 item
  10. 13.7" 1 item
  11. 14.5" 4 items
  12. 16" 3 items
  13. 17" 1 item
  14. 18" 1 item
Caliber
  1. .22 ARC 1 item
  2. .223 Wylde 2 items
  3. 300 Blackout 1 item
  4. 5.56 NATO 10 items
  5. 9mm 4 items
Category
  1. Receiver Parts 28 items
  2. Gas Systems 1 item
  3. Grips 43 items
  4. Rifle Handguards 64 items
  5. Stocks & Braces 3 items
Color
Configuration
  1. AR-15 3 items
  2. M-LOK 1 item
Finish
  1. Black 1 item
  2. Carbon Fiber 1 item
  3. Cerakote 1 item
  4. FDE 1 item
  5. Phosphate 1 item
  6. Anodize 10 items
Gas Block Diameter
  1. .750" 5 items
Gas System Length
  1. Carbine 3 items
  2. Mid 8 items
  3. Rifle 1 item
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.15" 1 item
  2. 1.3" 5 items
  3. 1.31" 1 item
  4. 1.34" 3 items
  5. 1.39" 1 item
  6. 1.54" 1 item
Manufacturer
  1. A3 Tactical 6 items
  2. Aero Precision 1 item
  3. Arisaka 3 items
  4. B5 Systems 2 items
  5. Bravo Company MFG (BCM) 7 items
  6. Brigand Arms 1 item
  7. Centurion Arms 1 item
  8. Cobalt Kinetics 1 item
  9. Cross Machine Tool (CMT) 1 item
  10. Daniel Defense 6 items
  11. Drew Meyers Defense 4 items
  12. Driven Arms Co. 2 items
  13. Emissary Development 3 items
  14. F-1 Firearms 1 item
  15. Fortis MFG 7 items
  16. Forward Controls Design 6 items
  17. Geissele 4 items
  18. Griffin Armament 2 items
  19. HERA ARMS 1 item
  20. Heresy Design 1 item
  21. Icon Defense 1 item
  22. JMAC Customs 11 items
  23. Kinetic Development Group 1 item
  24. Kratos Design Group 1 item
  25. Lewis Machine & Tool (LMT) 4 items
  26. Magpul Industries 9 items
  27. Matador Arms 1 item
  28. Maxim Defense 4 items
  29. Midwest Industries 5 items
  30. Next Level Armament 2 items
  31. Noveske 4 items
  32. Quarter Circle 10 2 items
  33. Radian Weapons 2 items
  34. Rainier Arms, LLC 2 items
  35. Rainier Industries 2 items
  36. Rise Armament 2 items
  37. ROAM Rifles 4 items
  38. RogueOps 1 item
  39. RS Regulate 1 item
  40. Sharps Bros 4 items
  41. SLR Rifleworks 1 item
  42. Sons of Liberty Gun Works 4 items
  43. Strike Industries 1 item
  44. True North Concepts 7 items
  45. Unity Tactical 1 item
  46. V Seven Weapon Systems 1 item
Model
  1. CZ Scorpion 2 items
  2. Sig MPX 1 item
Option
  1. AK-47/74 1 item
  2. AR-15 24 items
  3. Long 1 item
  4. CZ 2 items
  5. Sig Sauer 1 item
  6. Green Laser 1 item
Platform
  1. AR-15 25 items
  2. AK47/74 6 items
  3. CZ 2 items
  4. H&K 1 item
  5. Sig Sauer 1 item
Product Type
  1. Accessory 1 item
  2. Angled Grip 6 items
  3. AR-10 Partial Upper Receiver 1 item
  4. AR-15 Complete Upper Receiver 10 items
  5. AR-15 Partial Upper Receiver 7 items
  6. AR-15 Handguard 37 items
  7. AR-9 Upper Receiver 2 items
  8. Cable Clip 1 item
  9. Chassis 4 items
  10. Complete Upper 4 items
  11. Finger Stop 1 item
  12. Forearm Accesory 4 items
  13. Handguard 25 items
  14. Handstop 23 items
  15. Rail Adapter 1 item
  16. Rail Panel 2 items
  17. Stock 2 items
  18. Stock Adapter 1 item
  19. Vertical Grip 15 items
Rail Length
  1. 3.25" 1 item
  2. 4.25" 3 items
  3. 4.5" 2 items
  4. 4.9" 1 item
  5. 5.5" 1 item
  6. 5.99" 1 item
  7. 6.25" 2 items
  8. 6.375" 1 item
  9. 6.5" 1 item
  10. 6.7" 4 items
  11. 6.75" 2 items
  12. 7" 6 items
  13. 7.2" 1 item
  14. 7.25" 1 item
  15. 7.3" 1 item
  16. 7.5" 2 items
  17. 7.8" 1 item
  18. 8" 2 items
  19. 8.5" 1 item
  20. 8.6" 1 item
  21. 9" 5 items
  22. 9.15" 2 items
  23. 9.25" 1 item
  24. 9.3" 2 items
  25. 9.5" 9 items
  26. 9.55" 3 items
  27. 9.59" 1 item
  28. 9.6" 4 items
  29. 10" 5 items
  30. 10.3" 1 item
  31. 10.5" 6 items
  32. 10.64" 2 items
  33. 10.7" 3 items
  34. 11" 2 items
  35. 11.1" 1 item
  36. 11.5" 2 items
  37. 11.7" 3 items
  38. 11.8" 4 items
  39. 12" 1 item
  40. 12.3" 1 item
  41. 12.4" 2 items
  42. 12.5" 8 items
  43. 13" 8 items
  44. 13.25" 1 item
  45. 13.5" 9 items
  46. 13.7" 3 items
  47. 13.8" 4 items
  48. 14" 5 items
  49. 14.3" 1 item
  50. 15" 22 items
  51. 15.25" 1 item
  52. 15.3" 5 items
  53. 16.3" 1 item
  54. 16.5" 2 items
  55. 17" 1 item
Size
  1. 3 Slot 1 item
  2. 5 Slot 1 item
  3. 9 Slot 1 item
Thread Pitch
  1. 1/2x28 (9mm) 1 item
  2. 1/2x28 (.22 cal) 7 items
Threaded
  1. Yes 7 items
Twist Rate
  1. 1:7 8 items
  2. 1:10 1 item
Stock Status
  1. In stock 138 items Remove This Item
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