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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. Platform AR-15 Remove This Item
  2. Price $200.00 - $299.99 Remove This Item
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Barrel Length
  1. 4" 2 items
  2. 5" 3 items
  3. 6" 3 items
  4. 7.5" 1 item
  5. 7.75" 1 item
  6. 8.5" 3 items
  7. 10.3" 1 item
  8. 10.5" 9 items
  9. 10.7" 2 items
  10. 11.5" 1 item
  11. 12" 3 items
  12. 12.3" 1 item
  13. 12.5" 3 items
  14. 13.7" 2 items
  15. 13.9" 2 items
  16. 14.5" 7 items
  17. 16" 27 items
  18. 16.1" 1 item
  19. 18" 14 items
  20. 20" 3 items
  21. 22" 2 items
Barrel Profile
  1. DMR 2 items
  2. Lightweight 10 items
  3. M16A1 1 item
  4. MK12 SPR 8 items
Caliber
  1. .223 Wylde 28 items
  2. .458 Socom 2 items
  3. 300 Blackout 8 items
  4. 350 Legend 2 items
  5. 5.56X45 1 item
  6. 5.56 NATO 17 items
  7. 6mm ARC 15 items
  8. 6.5 Grendel 5 items
  9. 9mm 14 items
Category
  1. Receiver Parts 3 items
  2. Barrels 91 items
  3. Trigger Parts 4 items
  4. Bolt Parts 1 item
  5. Rifle Handguards 12 items
  6. Stocks & Braces 2 items
Color
Finish
  1. Cerakote 1 item
  2. Nitride 35 items
  3. Polished 5 items
  4. Satin 32 items
Gas Block Diameter
  1. .625" 15 items
  2. .750" 56 items
  3. .875" 5 items
Gas System Length
  1. Blowback 14 items
  2. Pistol 13 items
  3. Carbine 12 items
  4. Mid 29 items
  5. Rifle 17 items
  6. Rifle +2 2 items
Manufacturer
  1. Aero Precision 1 item
  2. Ballistic Advantage 14 items
  3. Bravo Company MFG (BCM) 2 items
  4. Centurion Arms 4 items
  5. Faxon Firearms 12 items
  6. Forward Controls Design 2 items
  7. Lewis Machine & Tool (LMT) 2 items
  8. Maxim Defense 1 item
  9. Noveske 4 items
  10. Q, LLC 1 item
  11. Radian Weapons 1 item
  12. Rainier Arms, LLC 58 items
  13. ROAM Rifles 4 items
  14. Sharps Bros 1 item
  15. Sons of Liberty Gun Works 3 items
  16. VKTR Industries 3 items
Mount
  1. M-LOK 9 items
  2. Picatinny 3 items
Option
  1. AR-15 3 items
Price
  1. $200.00 - $209.99 21 items
  2. $210.00 - $219.99 2 items
  3. $220.00 - $229.99 4 items
  4. $230.00 - $239.99 9 items
  5. $240.00 - $249.99 5 items
  6. $250.00 - $259.99 7 items
  7. $260.00 - $269.99 45 items
  8. $270.00 - $279.99 4 items
  9. $280.00 - $289.99 7 items
  10. $290.00 and above 9 items
Product Type
  1. AR-15 Barrel 91 items
  2. AR-15 Complete Lower Receiver 1 item
  3. AR-15 Handguard 12 items
  4. AR-15 Receiver Set 1 item
  5. AR-15 Stripped Lower Receiver 1 item
  6. Bolt Carrier Group 1 item
  7. Brace 1 item
  8. Handguard 2 items
  9. Stock 1 item
  10. Trigger 4 items
Rail Length
  1. 7.2" 2 items
  2. 9.15" 1 item
  3. 9.5" 2 items
  4. 10" 2 items
  5. 11.1" 1 item
  6. 11.5" 2 items
  7. 12" 1 item
  8. 12.5" 2 items
  9. 13" 1 item
  10. 13.5" 2 items
  11. 15" 3 items
Thread Pitch
  1. 1/2x28 (9mm) 13 items
  2. 1/2x28 (.22 cal) 42 items
  3. 5/8x24 (.30 cal) 30 items
  4. 11/16x24 2 items
Twist Rate
  1. 1:7 22 items
  2. 1:7.5 7 items
  3. 1:8 43 items
  4. 1:10 16 items
  5. 1:14 2 items
Stock Status
  1. In stock 81 items
  2. Out of stock 32 items
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