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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. Price $200.00 - $299.99 Remove This Item
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Barrel Length
  1. 3.66" 1 item
  2. 4" 2 items
  3. 5" 3 items
  4. 6" 3 items
  5. 7.5" 1 item
  6. 7.75" 1 item
  7. 8" 1 item
  8. 8.5" 3 items
  9. 10.3" 1 item
  10. 10.5" 8 items
  11. 10.7" 2 items
  12. 12" 2 items
  13. 12.3" 1 item
  14. 12.5" 3 items
  15. 13.7" 1 item
  16. 13.9" 2 items
  17. 14.5" 6 items
  18. 16" 19 items
  19. 18" 13 items
  20. 20" 3 items
  21. 22" 3 items
Barrel Profile
  1. Lightweight 10 items
  2. M16A1 1 item
  3. MK12 SPR 5 items
Caliber
  1. .223/5.56 1 item
  2. .223 Wylde 23 items
  3. .308 2 items
  4. .308 Win 3 items
  5. .458 Socom 1 item
  6. 300 Blackout 8 items
  7. 350 Legend 2 items
  8. 5.56 NATO 9 items
  9. 6mm ARC 10 items
  10. 6.5 Creedmoor 2 items
  11. 6.5 Grendel 5 items
  12. 8.6 Blackout 2 items
  13. 9mm 13 items
Category
  1. Receiver Parts 24 items
  2. Barrels 76 items
  3. Buffer Systems 6 items
  4. Trigger Parts 44 items
  5. Gas Systems 5 items
  6. Bolt Parts 10 items
  7. Charging Handles 1 item
  8. Rifle Handguards 42 items
  9. Stocks & Braces 26 items
Color
Configuration
  1. AR-15 4 items
  2. Clamp on Piston Block 1 item
  3. Curved 11 items
  4. Flat 15 items
  5. M-LOK 1 item
  6. Solid Piston Block 1 item
  7. Straight 3 items
Finish
  1. Cerakote 1 item
  2. Nitride 31 items
  3. Polished 4 items
  4. Satin 27 items
  5. Anodize 6 items
Gas Block Diameter
  1. .625" 14 items
  2. .750" 47 items
  3. .875" 7 items
  4. .936" 1 item
Gas System Length
  1. Blowback 12 items
  2. Pistol 18 items
  3. Carbine 14 items
  4. Mid 25 items
  5. Intermediate 1 item
  6. Rifle 21 items
  7. Rifle +2 2 items
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.3" 2 items
  2. 1.31" 1 item
  3. 1.34" 2 items
  4. 1.4" 1 item
Manufacturer
  1. A3 Tactical 8 items
  2. Agency Arms 1 item
  3. American Trigger Company (ATC) 3 items
  4. Andro Corp Industries 3 items
  5. B5 Systems 2 items
  6. Ballistic Advantage 10 items
  7. Bravo Company MFG (BCM) 6 items
  8. Centurion Arms 4 items
  9. DPM Systems Technologies 2 items
  10. Elftmann Tactical 3 items
  11. F5 MFG 2 items
  12. Faxon Firearms 10 items
  13. Fortis MFG 7 items
  14. Forward Controls Design 7 items
  15. FosTecH 1 item
  16. Geissele 7 items
  17. Grand Power 1 item
  18. Griffin Armament 1 item
  19. HB Industries 1 item
  20. Heresy Design 1 item
  21. Hiperfire 2 items
  22. JL Billet 1 item
  23. JMAC Customs 8 items
  24. JP Enterprises Inc 7 items
  25. Kinetic Development Group 2 items
  26. Lantac 1 item
  27. Magpul Industries 1 item
  28. Maxim Defense 1 item
  29. Next Level Armament 1 item
  30. Noveske 5 items
  31. Precision Reflex Inc 1 item
  32. Rainier Arms, LLC 56 items
  33. Rainier Industries 1 item
  34. Rise Armament 4 items
  35. ROAM Rifles 4 items
  36. RogueOps 1 item
  37. RS Regulate 5 items
  38. Samson Manufacturing Corp. 1 item
  39. SB Tactical 2 items
  40. Sharps Bros 5 items
  41. Sig Sauer 3 items
  42. SLR Rifleworks 1 item
  43. Sons of Liberty Gun Works 4 items
  44. Superlative Arms 4 items
  45. Tactical Edge Arms 1 item
  46. Timney Triggers 23 items
  47. Triggertech 4 items
  48. V Seven Weapon Systems 2 items
  49. VLTOR 1 item
Model
  1. CZ Bren 1 item
  2. CZ Scorpion 1 item
  3. FNH Scar 1 item
  4. H&K G36 1 item
  5. IWI Tavor 1 item
  6. Remington 700 3 items
  7. RIA VR80 1 item
  8. Sig MCX 2 items
  9. Sig MPX 3 items
Mount
  1. M-LOK 26 items
  2. Picatinny 18 items
Option
  1. AR-9 1 item
  2. AR-10 3 items
  3. AR-15 36 items
  4. H2 Buffer 2 items
  5. CZ 2 items
  6. B&T APC 1 item
  7. Dimpled 1 item
Platform
  1. AR-10/LR308 8 items
  2. AR-15 81 items
  3. AK47/74 2 items
  4. CZ 1 item
  5. FNH 1 item
  6. IWI 1 item
  7. Remington 2 items
  8. Remington 700 1 item
  9. Sig Sauer 3 items
Product Type
  1. AR-10/LR308 Barrel 7 items
  2. AR-10 Handguard 1 item
  3. AR-15 Assembled Upper Receiver 1 item
  4. AR-15 Barrel 69 items
  5. AR-15 Complete Lower Receiver 4 items
  6. AR-15 Partial Upper Receiver 1 item
  7. AR-15 Handguard 23 items
  8. AR-15 Receiver Set 2 items
  9. AR-15 Stripped Lower Receiver 11 items
  10. AR-15 Stripped Upper Receiver 2 items
  11. AR-9 Complete Lower Receiver 1 item
  12. AR-9 Receiver Set 1 item
  13. Bolt 3 items
  14. Bolt Carrier Group 6 items
  15. Brace 7 items
  16. Buffer 1 item
  17. Buffer Kit 1 item
  18. Buffer Spring 3 items
  19. Buffer Tube 1 item
  20. Chassis 1 item
  21. Gas Block 1 item
  22. Handguard 20 items
  23. Piston System 4 items
  24. Stock 16 items
  25. Stock Accessory 2 items
  26. Stock Adapter 1 item
  27. Trigger 44 items
Rail Length
  1. 3.25" 1 item
  2. 4.25" 1 item
  3. 4.9" 1 item
  4. 6.0" 2 items
  5. 6.375" 1 item
  6. 6.5" 1 item
  7. 6.7" 2 items
  8. 7" 3 items
  9. 7.2" 1 item
  10. 8" 1 item
  11. 9" 3 items
  12. 9.15" 2 items
  13. 9.3" 1 item
  14. 9.5" 4 items
  15. 9.55" 1 item
  16. 9.59" 1 item
  17. 9.6" 3 items
  18. 10" 5 items
  19. 10.5" 1 item
  20. 11" 1 item
  21. 11.1" 1 item
  22. 11.5" 3 items
  23. 11.75" 1 item
  24. 11.8" 3 items
  25. 12" 3 items
  26. 12.5" 2 items
  27. 12.55" 1 item
  28. 13" 5 items
  29. 13.5" 3 items
  30. 13.8" 3 items
  31. 15" 8 items
  32. 15.3" 3 items
  33. 16.5" 1 item
  34. 17" 1 item
Size
  1. 9 Slot 1 item
Thread Pitch
  1. 1/2x28 (9mm) 12 items
  2. 1/2x28 (.22 cal) 30 items
  3. 5/8x24 (.30 cal) 30 items
  4. 11/16x24 1 item
  5. M18x1.5 2 items
Twist Rate
  1. 1:3 2 items
  2. 1:7 9 items
  3. 1:7.5 7 items
  4. 1:8 40 items
  5. 1:10 17 items
  6. 1:14 1 item
Stock Status
  1. In stock 232 items Remove This Item
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