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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. Gas Block Diameter .750" Remove This Item
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Barrel Length
  1. 6.5" 1 item
  2. 6.75" 1 item
  3. 7.5" 2 items
  4. 7.75" 1 item
  5. 8" 6 items
  6. 8.5" 3 items
  7. 9" 1 item
  8. 10" 3 items
  9. 10.3" 4 items
  10. 10.5" 19 items
  11. 10.7" 1 item
  12. 11.5" 4 items
  13. 12" 6 items
  14. 12.3" 1 item
  15. 12.5" 12 items
  16. 13.7" 4 items
  17. 13.9" 3 items
  18. 14.5" 12 items
  19. 16" 43 items
  20. 16.1" 2 items
  21. 18" 23 items
  22. 20" 7 items
  23. 22" 2 items
  24. 24" 1 item
Barrel Profile
  1. Lightweight 1 item
  2. M110 1 item
  3. MK12 SPR 7 items
  4. Non-fluted 1 item
Caliber
  1. .223/5.56 1 item
  2. .223 Wylde 23 items
  3. .308 Win 14 items
  4. 300 Blackout 23 items
  5. 350 Legend 2 items
  6. 5.56 NATO 54 items
  7. 6mm ARC 13 items
  8. 6.5 Creedmoor 8 items
  9. 6.5 Grendel 12 items
  10. 7.62x39 2 items
  11. 7.62x51 4 items
  12. 8.6 Blackout 2 items
Category
  1. Receiver Parts 15 items
  2. Barrels 143 items
  3. Gas Systems 20 items
Color
Configuration
  1. .625 DIA 2 items
  2. .750 DIA 1 item
  3. .875 DIA 1 item
  4. .936 DIA 2 items
Finish
  1. Bead Blast Stainless Steel 1 item
  2. Melonite 1 item
  3. Nitride 55 items
  4. Polished 12 items
  5. Satin 34 items
  6. Anodize 1 item
  7. Quench Polish Quench (QPQ) 1 item
Gas System Length
  1. Pistol -1 1 item
  2. Pistol 31 items
  3. Carbine 29 items
  4. Mid 54 items
  5. Intermediate 6 items
  6. Rifle 37 items
  7. Rifle +1 3 items
  8. Rifle +2 1 item
Inside Diameter
  1. 1.3" 1 item
Manufacturer
  1. Aero Precision 1 item
  2. Andro Corp Industries 3 items
  3. Ballistic Advantage 13 items
  4. Boss Barrels 7 items
  5. Centurion Arms 1 item
  6. Daniel Defense 3 items
  7. Faxon Firearms 16 items
  8. Fortis MFG 1 item
  9. Geissele 3 items
  10. Kratos Design Group 1 item
  11. NEMO Arms 1 item
  12. Noveske 9 items
  13. Precision Reflex Inc 1 item
  14. Rainier Arms, LLC 93 items
  15. Riflespeed 1 item
  16. Sharps Bros 1 item
  17. Sons of Liberty Gun Works 9 items
  18. Spinta Precision 1 item
  19. Superlative Arms 11 items
  20. Tactical Edge Arms 1 item
  21. TruCalibre 1 item
Mount
  1. M-LOK 5 items
Option
  1. AR-10 1 item
  2. AR-15 1 item
  3. Adjustable 9 items
  4. Non-Adjustable 5 items
Platform
  1. AR-10/LR308 27 items
  2. AR-15 121 items
Price
  1. $0.00 - $999.99 175 items
  2. $1,000.00 and above 3 items
Product Type
  1. AR-10/LR308 Barrel 27 items
  2. AR-15 Barrel 116 items
  3. AR-15 Complete Upper Receiver 6 items
  4. AR-15 Partial Upper Receiver 8 items
  5. AR-15 Handguard 1 item
  6. Gas Block 18 items
  7. Piston System 2 items
Rail Length
  1. 7" 2 items
  2. 9" 1 item
  3. 9.5" 2 items
  4. 9.55" 3 items
  5. 10.7" 1 item
  6. 11.7" 1 item
  7. 11.75" 1 item
  8. 13.7" 1 item
  9. 15" 5 items
Size
  1. 1.9" 1 item
  2. 2.1" 1 item
  3. 3.3" 1 item
  4. 4.3" 1 item
  5. 4.8" 1 item
  6. 5.8" 1 item
Thread Pitch
  1. 1/2x28 (.22 cal) 78 items
  2. 3/4x24 1 item
  3. 5/8x24 (.30 cal) 76 items
  4. M18x1.5 2 items
Threaded
  1. Yes 7 items
Twist Rate
  1. 1:3 2 items
  2. 1:7 61 items
  3. 1:7.5 17 items
  4. 1:8 53 items
  5. 1:10 19 items
Stock Status
  1. In stock 174 items Remove This Item
  2. Out of stock 4 items
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