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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. Mount M-LOK Remove This Item
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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. 10.5" 3 items
  6. 11.5" 1 item
  7. 12.5" 1 item
  8. 14.5" 2 items
  9. 16" 2 items
  10. 17" 1 item
  11. 18" 1 item
Caliber
  1. .22 ARC 1 item
  2. 5.56 NATO 5 items
  3. 9mm 4 items
Category
  1. Receiver Parts 17 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" 3 items
Gas System Length
  1. Carbine 2 items
  2. Mid 3 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 3 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 7 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 10 items
  23. Kinetic Development Group 1 item
  24. Kratos Design Group 1 item
  25. Lewis Machine & Tool (LMT) 3 items
  26. Magpul Industries 9 items
  27. Matador Arms 1 item
  28. Midwest Industries 5 items
  29. Next Level Armament 2 items
  30. Noveske 3 items
  31. Quarter Circle 10 2 items
  32. Rainier Arms, LLC 2 items
  33. Rainier Industries 2 items
  34. Rise Armament 2 items
  35. ROAM Rifles 4 items
  36. RogueOps 1 item
  37. RS Regulate 1 item
  38. Sharps Bros 4 items
  39. SLR Rifleworks 1 item
  40. Sons of Liberty Gun Works 4 items
  41. Strike Industries 1 item
  42. True North Concepts 7 items
  43. Unity Tactical 1 item
  44. 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 23 items
  3. Long 1 item
  4. CZ 2 items
  5. Sig Sauer 1 item
  6. Green Laser 1 item
Platform
  1. AR-15 20 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-15 Complete Upper Receiver 3 items
  4. AR-15 Partial Upper Receiver 7 items
  5. AR-15 Handguard 37 items
  6. AR-9 Upper Receiver 2 items
  7. Cable Clip 1 item
  8. Chassis 4 items
  9. Finger Stop 1 item
  10. Forearm Accesory 4 items
  11. Handguard 24 items
  12. Handstop 23 items
  13. Rail Adapter 1 item
  14. Rail Panel 2 items
  15. Sling Mount 1 item
  16. Stock 2 items
  17. Stock Adapter 1 item
  18. 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. 8.6" 1 item
  20. 9" 5 items
  21. 9.15" 2 items
  22. 9.25" 1 item
  23. 9.3" 2 items
  24. 9.5" 7 items
  25. 9.55" 3 items
  26. 9.59" 1 item
  27. 9.6" 4 items
  28. 10" 5 items
  29. 10.3" 1 item
  30. 10.5" 6 items
  31. 10.64" 2 items
  32. 10.7" 3 items
  33. 11" 2 items
  34. 11.1" 1 item
  35. 11.5" 2 items
  36. 11.7" 3 items
  37. 11.8" 4 items
  38. 12" 1 item
  39. 12.3" 1 item
  40. 12.4" 2 items
  41. 12.5" 7 items
  42. 13" 8 items
  43. 13.25" 1 item
  44. 13.5" 9 items
  45. 13.7" 3 items
  46. 13.8" 4 items
  47. 14" 5 items
  48. 14.3" 1 item
  49. 15" 21 items
  50. 15.25" 1 item
  51. 15.3" 4 items
  52. 16.3" 1 item
  53. 16.5" 2 items
  54. 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) 5 items
Threaded
  1. Yes 6 items
Twist Rate
  1. 1:7 4 items
  2. 1:10 1 item
Stock Status
  1. In stock 126 items Remove This Item
  2. Out of stock 1 item
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