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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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Items 17-32 of 190

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  3. Angstadt Arms 9mm AR-15 Barrel - 6"
    Angstadt Arms 9mm AR-15 Barrel - 6"
    $108.00
    Out of stock
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  5. WMD Guns 5.56 Accent Build Kit - FDE
    WMD Guns 5.56 Accent Build Kit - FDE
    $115.00
    Out of stock
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  7. Midwest Industries AK Drop-In Universal M-LOK Handguard
    Midwest Industries AK Drop-In Universal M-LOK Handguard
    $110.95
    Out of stock
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  12. WMD Guns AR15 Bolt Carrier Group - NiB-X (Black)
    WMD Guns AR15 Bolt Carrier Group - NiB-X (Black)
    $190.00
    Out of stock
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  13. Aero Precision EPC-9 Lower Receiver - FDE
    Aero Precision EPC-9 Lower Receiver - FDE
    $189.99
    Out of stock
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  14. WMD Guns AR15 Bolt Carrier Group - NiB-X
    WMD Guns AR15 Bolt Carrier Group - NiB-X
    $164.00
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  16. Silencerco ASR Blast Shield
    Silencerco ASR Blast Shield
    $126.65
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Items 17-32 of 190

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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" 2 items
  6. 9" 1 item
  7. 10.5" 3 items
  8. 11" 1 item
  9. 11.5" 2 items
  10. 12.5" 3 items
  11. 13.9" 1 item
  12. 16" 4 items
  13. 18" 2 items
  14. 20" 2 items
Barrel Profile
  1. Dissipator 2 items
  2. MK12 SPR 1 item
Caliber
  1. .223/5.56 2 items
  2. .223 Wylde 2 items
  3. .30 Cal 1 item
  4. .308 2 items
  5. .308 Win 1 item
  6. .38/.357 Magnum 1 item
  7. .45 ACP 1 item
  8. 300 Blackout 8 items
  9. 5.56 NATO 19 items
  10. 6.5 Grendel 2 items
  11. 7.62mm 2 items
  12. 8.6 Blackout 1 item
  13. 9mm 7 items
Category
  1. Receiver Parts 31 items
  2. Parts & Kits 6 items
  3. Barrels 25 items
  4. Buffer Systems 12 items
  5. Trigger Parts 13 items
  6. Gas Systems 3 items
  7. Muzzle Devices 26 items
  8. Bolt Parts 18 items
  9. Grips 7 items
  10. Charging Handles 9 items
  11. Rifle Handguards 28 items
  12. Stocks & Braces 17 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. Melonite 1 item
  4. Nickel Boron 1 item
  5. Nitride 12 items
  6. Phosphate 3 items
  7. Anodize 9 items
  8. Quench Polish Quench (QPQ) 1 item
Gas Block Diameter
  1. .625" 2 items
  2. .750" 16 items
Gas System Length
  1. Blowback 4 items
  2. Pistol 7 items
  3. Carbine 6 items
  4. Mid 1 item
  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. Aero Precision 23 items
  2. Aeroknox 1 item
  3. ALG Defense 1 item
  4. Angstadt Arms 3 items
  5. Arms Republic 1 item
  6. B5 Systems 4 items
  7. Ballistic Advantage 12 items
  8. Battle Arms Development 5 items
  9. Bootleg 1 item
  10. Centurion Arms 1 item
  11. Chisel Machining 1 item
  12. Cross Machine Tool (CMT) 6 items
  13. F5 MFG 1 item
  14. Faxon Firearms 13 items
  15. Ferfrans 1 item
  16. Fortis MFG 3 items
  17. Gear Head Works 2 items
  18. Geissele 6 items
  19. Griffin Armament 2 items
  20. HB Industries 3 items
  21. HERA ARMS 2 items
  22. Hiperfire 7 items
  23. HUXWRX 5 items
  24. Icon Defense 1 item
  25. JMAC Customs 5 items
  26. JP Enterprises Inc 3 items
  27. Kinetic Development Group 1 item
  28. Knight’s Armament Company (KAC) 3 items
  29. KNS Precision 1 item
  30. Kalashnikov USA 1 item
  31. KynSHOT 3 items
  32. Lantac 2 items
  33. Magpul Industries 1 item
  34. Midwest Industries 12 items
  35. NEMO Arms 2 items
  36. Next Level Armament 3 items
  37. Noveske 1 item
  38. Precision Armament 3 items
  39. Primary Weapon Systems 2 items
  40. Q, LLC 2 items
  41. Radian Weapons 2 items
  42. Raidworx 1 item
  43. Rainier Arms, LLC 5 items
  44. Rainier Industries 1 item
  45. Reptilia Corp 4 items
  46. Rise Armament 1 item
  47. SB Tactical 2 items
  48. Silencerco 1 item
  49. Sionics Weapon Systems 1 item
  50. Sons of Liberty Gun Works 3 items
  51. Spinta Precision 2 items
  52. Surefire 2 items
  53. Timney Triggers 1 item
  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 1 item
Mount
  1. M-LOK 13 items
  2. Picatinny 5 items
Option
  1. AK-47/74 2 items
  2. AR-9 2 items
  3. AR-10 3 items
  4. AR-15 38 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 37 items
  4. AK47/74 1 item
  5. FNH 1 item
  6. IWI 1 item
  7. Sig Sauer 2 items
Price
  1. $100.00 - $109.99 27 items
  2. $110.00 - $119.99 21 items
  3. $120.00 - $129.99 18 items
  4. $130.00 - $139.99 16 items
  5. $140.00 - $149.99 27 items
  6. $150.00 - $159.99 22 items
  7. $160.00 - $169.99 12 items
  8. $170.00 - $179.99 14 items
  9. $180.00 - $189.99 11 items
  10. $190.00 and above 22 items
Product Type
  1. AR-10/LR308 Barrel 1 item
  2. AR-10 / LR 308 Charging Handle 3 items
  3. AR-10 Complete Upper Receiver 1 item
  4. AR-10 Handguard 2 items
  5. AR-15 Assembled Upper Receiver 2 items
  6. AR-15 Barrel 24 items
  7. AR-15 Charging Handle 5 items
  8. AR-15 Handguard 10 items
  9. AR-15 Stripped Lower Receiver 15 items
  10. AR-15 Stripped Upper Receiver 12 items
  11. AR-9 Lower Receiver 1 item
  12. Blast Shield 1 item
  13. Bolt 3 items
  14. Bolt Carrier Group 15 items
  15. Brace 3 items
  16. Buffer 3 items
  17. Buffer Kit 4 items
  18. Buffer Spring 2 items
  19. Buffer Tube 3 items
  20. Builders Kit 1 item
  21. Charging Handle 2 items
  22. Compensator 2 items
  23. Flash Hider 8 items
  24. Forearm Accesory 1 item
  25. Gas Block 1 item
  26. Handguard 13 items
  27. Lower Parts Kit 3 items
  28. Muzzle Brake 11 items
  29. Muzzle Device Accessory 4 items
  30. Pistol Grip 3 items
  31. Piston System 2 items
  32. Rail Adapter 2 items
  33. Rail Section 1 item
  34. Safety Selector 1 item
  35. Stock 8 items
  36. Stock Accessory 3 items
  37. Stock Adapter 3 items
  38. 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) 20 items
  4. 1/2x36 1 item
  5. 5/8x24 (.30 cal) 15 items
  6. M14x1 LH 1 item
  7. M24x1.5 RH 1 item
Threaded
  1. Yes 6 items
Twist Rate
  1. 1:5 2 items
  2. 1:7 9 items
  3. 1:8 8 items
  4. 1:10 6 items
Stock Status
  1. Out of stock 190 items Remove This Item
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