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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. Rainier Arms Exclusive Spinta Precision .223 Wylde Dissipator AR-15 Barrel - 16" (Rainier Arms Exclusive)
    Spinta Precision .223 Wylde Dissipator AR-15 Barrel - 16" (Rainier Arms Exclusive)
    Special Price $149.99 Regular Price $199.99
    Out of stock
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  6. Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    $855.00
    Out of stock
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  10. Noveske Lo Pro Gas Block .750 2 Screw
    Noveske Lo Pro Gas Block .750 2 Screw
    $61.75
    Out of stock
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  11. Rainier Arms Match 6mm ARC AR-15 Barrel - 12"
    Rainier Arms Match 6mm ARC AR-15 Barrel - 12"
    $260.00
    Out of stock
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  14. Aero Precision Low Profile Adjustable Gas Block - .750
    Aero Precision Low Profile Adjustable Gas Block - .750
    $71.99
    Out of stock
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  1. Gas Block Diameter .750" Remove This Item
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Barrel Length
  1. 6" 1 item
  2. 6.5" 1 item
  3. 6.75" 1 item
  4. 7.5" 4 items
  5. 7.75" 1 item
  6. 8" 6 items
  7. 8.3" 1 item
  8. 8.5" 3 items
  9. 9" 2 items
  10. 10" 3 items
  11. 10.3" 4 items
  12. 10.5" 26 items
  13. 10.7" 2 items
  14. 11.5" 10 items
  15. 12" 9 items
  16. 12.3" 1 item
  17. 12.5" 18 items
  18. 13.7" 4 items
  19. 13.9" 3 items
  20. 14.5" 15 items
  21. 16" 58 items
  22. 16.1" 3 items
  23. 18" 34 items
  24. 20" 15 items
  25. 22" 2 items
  26. 24" 1 item
Barrel Profile
  1. Dissipator 2 items
  2. DMR 2 items
  3. Lightweight 1 item
  4. M110 1 item
  5. MK12 SPR 12 items
  6. Non-fluted 2 items
Caliber
  1. .22 ARC 2 items
  2. .223/5.56 1 item
  3. .223 Wylde 34 items
  4. .308 Win 18 items
  5. 300 Blackout 31 items
  6. 350 Legend 2 items
  7. 5.56 NATO 86 items
  8. 6mm ARC 19 items
  9. 6.5 Creedmoor 9 items
  10. 6.5 Grendel 13 items
  11. 7.62x39 2 items
  12. 7.62x51 4 items
  13. 8.6 Blackout 2 items
Category
  1. Receiver Parts 21 items
  2. Barrels 202 items
  3. Gas Systems 30 items
Color
Configuration
  1. .625 DIA 2 items
  2. .750 DIA 2 items
  3. .875 DIA 1 item
  4. .936 DIA 2 items
Finish
  1. Bead Blast Stainless Steel 1 item
  2. Black Nitride 1 item
  3. Cerakote 1 item
  4. Melonite 1 item
  5. Nitride 72 items
  6. Polished 13 items
  7. Satin 44 items
  8. Quench Polish Quench (QPQ) 3 items
Gas System Length
  1. Pistol -1 1 item
  2. Pistol 37 items
  3. Carbine 44 items
  4. Mid 70 items
  5. Intermediate 10 items
  6. Rifle 53 items
  7. Rifle +1 3 items
  8. Rifle +2 1 item
Height
  1. Absolute Co-Witness 2 items
Inside Diameter
  1. 1.3" 1 item
Manufacturer
  1. Aero Precision 4 items
  2. Andro Corp Industries 3 items
  3. Ballistic Advantage 30 items
  4. Battle Arms Development 1 item
  5. Boss Barrels 7 items
  6. Bravo Company MFG (BCM) 1 item
  7. Centurion Arms 3 items
  8. Daniel Defense 4 items
  9. Faxon Firearms 28 items
  10. Fortis MFG 1 item
  11. Geissele 5 items
  12. JP Enterprises Inc 1 item
  13. Kratos Design Group 1 item
  14. NEMO Arms 2 items
  15. Noveske 17 items
  16. Precision Reflex Inc 1 item
  17. Q, LLC 1 item
  18. Rainier Arms, LLC 109 items
  19. Riflespeed 1 item
  20. Sharps Bros 1 item
  21. Sons of Liberty Gun Works 12 items
  22. Spinta Precision 2 items
  23. Superlative Arms 12 items
  24. Tactical Edge Arms 1 item
  25. TruCalibre 1 item
  26. V Seven Weapon Systems 1 item
  27. VKTR Industries 3 items
Mount
  1. M-LOK 6 items
Option
  1. AR-10 1 item
  2. AR-15 1 item
  3. Adjustable 11 items
  4. Non-Adjustable 11 items
Platform
  1. AR-10/LR308 32 items
  2. AR-15 178 items
Price
  1. $0.00 - $99.99 24 items
  2. $100.00 - $199.99 51 items
  3. $200.00 - $299.99 66 items
  4. $300.00 - $399.99 46 items
  5. $400.00 - $499.99 36 items
  6. $500.00 - $599.99 14 items
  7. $600.00 - $699.99 9 items
  8. $700.00 - $799.99 5 items
  9. $800.00 and above 2 items
Product Type
  1. AR-10/LR308 Barrel 32 items
  2. AR-15 Barrel 170 items
  3. AR-15 Complete Upper Receiver 4 items
  4. AR-15 Partial Upper Receiver 15 items
  5. AR-15 Handguard 1 item
  6. AR-15 Upper Receiver Group 1 item
  7. Gas Block 28 items
  8. Piston System 2 items
Rail Length
  1. 7" 1 item
  2. 9" 1 item
  3. 9.5" 3 items
  4. 9.55" 4 items
  5. 10.7" 2 items
  6. 11.7" 2 items
  7. 11.75" 1 item
  8. 13.7" 2 items
  9. 15" 6 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) 123 items
  2. 3/4x24 1 item
  3. 5/8x24 (.30 cal) 97 items
  4. M18x1.5 2 items
Threaded
  1. Yes 12 items
  2. No 1 item
Twist Rate
  1. 1:3 2 items
  2. 1:5 2 items
  3. 1:7 99 items
  4. 1:7.5 23 items
  5. 1:8 67 items
  6. 1:10 23 items
Stock Status
  1. In stock 176 items
  2. Out of stock 77 items
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