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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 $100.00 - $199.99 Remove This Item
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Barrel Length
  1. 6" 2 items
  2. 7.5" 2 items
  3. 8" 1 item
  4. 8.3" 1 item
  5. 8.5" 3 items
  6. 9" 1 item
  7. 10.5" 5 items
  8. 11" 1 item
  9. 11.5" 2 items
  10. 12.5" 3 items
  11. 13.7" 1 item
  12. 13.9" 1 item
  13. 16" 4 items
  14. 18" 2 items
  15. 20" 2 items
Barrel Profile
  1. Dissipator 2 items
  2. MK12 SPR 1 item
Caliber
  1. .22 LR 1 item
  2. .223/5.56 2 items
  3. .223 Wylde 2 items
  4. .30 Cal 1 item
  5. .308 2 items
  6. .308 Win 1 item
  7. .38/.357 Magnum 1 item
  8. .45 ACP 1 item
  9. 300 Blackout 9 items
  10. 5.56 NATO 21 items
  11. 6.5 Grendel 2 items
  12. 7.62mm 2 items
  13. 7.62x51 1 item
  14. 8.6 Blackout 1 item
  15. 9mm 8 items
Category
  1. Receiver Parts 34 items
  2. Parts & Kits 5 items
  3. Barrels 29 items
  4. Buffer Systems 12 items
  5. Trigger Parts 13 items
  6. Gas Systems 3 items
  7. Muzzle Devices 24 items
  8. Bolt Parts 18 items
  9. Grips 7 items
  10. Charging Handles 8 items
  11. Rifle Handguards 28 items
  12. Stocks & Braces 18 items
Color
Configuration
  1. AR-15 3 items
  2. Carbine 1 item
  3. Curved 2 items
  4. Flat 2 items
  5. M-LOK 1 item
Finish
  1. Black Nitride 1 item
  2. Cerakote 3 items
  3. DLC 2 items
  4. Melonite 1 item
  5. Nickel Boron 2 items
  6. Nitride 15 items
  7. Phosphate 3 items
  8. Anodize 11 items
  9. Quench Polish Quench (QPQ) 1 item
  10. Titanium Nitride (TiN) 1 item
Gas Block Diameter
  1. .625" 2 items
  2. .750" 18 items
Gas System Length
  1. Blowback 4 items
  2. Pistol 8 items
  3. Carbine 7 items
  4. Mid 2 items
  5. Intermediate 1 item
  6. Rifle 4 items
Inside Diameter
  1. 1.3" 1 item
  2. 1.315" 3 items
  3. 1.34" 1 item
  4. 1.4" 1 item
  5. 1.42" 1 item
  6. 1.5" 1 item
Manufacturer
  1. A3 Tactical 1 item
  2. Aero Precision 24 items
  3. Aeroknox 1 item
  4. ALG Defense 1 item
  5. Angstadt Arms 3 items
  6. B5 Systems 4 items
  7. Ballistic Advantage 13 items
  8. Battle Arms Development 5 items
  9. Blitzkrieg Components 1 item
  10. Bootleg 1 item
  11. Centurion Arms 1 item
  12. Chisel Machining 1 item
  13. Cross Machine Tool (CMT) 6 items
  14. F5 MFG 1 item
  15. Faxon Firearms 15 items
  16. Ferfrans 1 item
  17. Fortis MFG 2 items
  18. Gear Head Works 2 items
  19. Geissele 4 items
  20. Griffin Armament 2 items
  21. HB Industries 3 items
  22. HERA ARMS 2 items
  23. Hiperfire 8 items
  24. HUXWRX 3 items
  25. Icon Defense 1 item
  26. JMAC Customs 3 items
  27. JP Enterprises Inc 3 items
  28. Kinetic Development Group 1 item
  29. Knight’s Armament Company (KAC) 4 items
  30. KNS Precision 1 item
  31. Kalashnikov USA 1 item
  32. KynSHOT 3 items
  33. Lantac 3 items
  34. Magpul Industries 1 item
  35. Midwest Industries 12 items
  36. NEMO Arms 2 items
  37. Next Level Armament 3 items
  38. Noveske 2 items
  39. Precision Armament 4 items
  40. Primary Weapon Systems 2 items
  41. Q, LLC 2 items
  42. Radian Weapons 1 item
  43. Raidworx 1 item
  44. Rainier Arms, LLC 6 items
  45. Reptilia Corp 4 items
  46. Rise Armament 2 items
  47. SB Tactical 2 items
  48. Sig Sauer 1 item
  49. Silencerco 1 item
  50. Sionics Weapon Systems 1 item
  51. Sons of Liberty Gun Works 4 items
  52. Spinta Precision 2 items
  53. Surefire 2 items
  54. Triggertech 1 item
  55. Troy Industries 1 item
  56. Tyrant Designs 4 items
  57. V Seven Weapon Systems 2 items
  58. VKTR Industries 1 item
  59. VLTOR 1 item
  60. WMD Guns 3 items
Model
  1. CZ Bren 1 item
  2. FNH Scar 1 item
  3. IWI Galil 1 item
  4. Sig MCX 2 items
Mount
  1. M-LOK 13 items
  2. Picatinny 5 items
Option
  1. AK-47/74 2 items
  2. AR-9 4 items
  3. AR-10 4 items
  4. AR-15 39 items
  5. CZ 1 item
  6. Glock 1 item
  7. Heckler & Koch 1 item
Platform
  1. AR-9 1 item
  2. AR-10/LR308 1 item
  3. AR-15 39 items
  4. AK47/74 1 item
  5. FNH 1 item
  6. IWI 1 item
  7. Ruger 10/22 1 item
  8. Sig Sauer 3 items
Product Type
  1. 10/22 Barrel 1 item
  2. AR-10/LR308 Barrel 1 item
  3. AR-10 / LR 308 Charging Handle 3 items
  4. AR-10 Complete Upper Receiver 1 item
  5. AR-10 Handguard 2 items
  6. AR-15 Assembled Upper Receiver 2 items
  7. AR-15 Barrel 27 items
  8. AR-15 Charging Handle 4 items
  9. AR-15 Handguard 10 items
  10. AR-15 Stripped Lower Receiver 15 items
  11. AR-15 Stripped Upper Receiver 13 items
  12. AR-9 Lower Receiver 2 items
  13. Blast Shield 1 item
  14. Bolt 2 items
  15. Bolt Carrier Group 15 items
  16. Brace 3 items
  17. Buffer 4 items
  18. Buffer Kit 3 items
  19. Buffer Spring 1 item
  20. Buffer Tube 3 items
  21. Builders Kit 1 item
  22. Charging Handle 2 items
  23. Compensator 2 items
  24. Flash Hider 9 items
  25. Forearm Accesory 1 item
  26. Gas Block 1 item
  27. Handguard 13 items
  28. Lower Parts Kit 2 items
  29. Lower Receiver 1 item
  30. Muzzle Brake 8 items
  31. Muzzle Device Accessory 4 items
  32. Parts Kit 1 item
  33. Pistol Grip 3 items
  34. Piston System 2 items
  35. Rail Adapter 2 items
  36. Rail Section 1 item
  37. Safety Selector 1 item
  38. Silent Captured Spring 1 item
  39. Stock 9 items
  40. Stock Accessory 3 items
  41. Stock Adapter 3 items
  42. Trigger 13 items
Rail Length
  1. 3" 1 item
  2. 4" 1 item
  3. 5.5" 1 item
  4. 6.0" 2 items
  5. 6.7" 3 items
  6. 7" 2 items
  7. 7.25" 1 item
  8. 7.9" 1 item
  9. 8.25" 1 item
  10. 9" 1 item
  11. 9.5" 3 items
  12. 9.6" 1 item
  13. 10.25" 1 item
  14. 10.5" 4 items
  15. 10.8" 1 item
  16. 12" 2 items
  17. 12.4" 1 item
  18. 12.5" 1 item
  19. 12.625" 1 item
  20. 13" 2 items
  21. 13.7" 3 items
  22. 13.8" 2 items
  23. 15" 9 items
  24. 15.3" 1 item
  25. 15.8" 1 item
Size
  1. BACK STRAP:Large 1 item
  2. BACK STRAP:Medium 2 items
  3. 9 Slot 1 item
Thread Pitch
  1. 1.125x28 1 item
  2. 1/2x28 (9mm) 4 items
  3. 1/2x28 (.22 cal) 21 items
  4. 1/2x36 1 item
  5. 5/8x24 (.30 cal) 17 items
  6. M14x1 LH 1 item
Threaded
  1. Yes 4 items
Twist Rate
  1. 1:5 2 items
  2. 1:7 11 items
  3. 1:8 9 items
  4. 1:10 6 items
  5. 1:16 1 item
Stock Status
  1. In stock 1 item
  2. Out of stock 193 items Remove This Item
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