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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 $400.00 - $499.99 Remove This Item
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Barrel Length
  1. 4" 1 item
  2. 8.3" 1 item
  3. 10" 2 items
  4. 10.5" 3 items
  5. 11.5" 1 item
  6. 12" 2 items
  7. 12.5" 2 items
  8. 16" 13 items
  9. 18" 16 items
  10. 20" 10 items
  11. 22" 10 items
  12. 24" 3 items
  13. 26" 2 items
Caliber
  1. .223 Wylde 6 items
  2. .308 Win 18 items
  3. 300 Blackout 6 items
  4. 300 Norma Mag 1 item
  5. 338 Lapua 1 item
  6. 5.56X45 1 item
  7. 5.56 NATO 1 item
  8. 6mm ARC 6 items
  9. 6.5 Creedmoor 12 items
  10. 6.5 Grendel 6 items
  11. 6.5 PRC 2 items
  12. 6MM Creedmoor 4 items
  13. 8.6 Blackout 1 item
  14. 9mm 2 items
Category
  1. Receiver Parts 16 items
  2. Barrels 65 items
  3. Trigger Parts 1 item
  4. Bolt Parts 5 items
  5. Grips 1 item
  6. Rifle Handguards 1 item
  7. Stocks & Braces 5 items
Color
Configuration
  1. Silent Captured Spring 9mm 1 item
Finish
  1. Black 1 item
  2. Nitride 2 items
  3. Polished 28 items
  4. Satin 27 items
  5. Anodize 3 items
  6. Clear Hard Anodize 2 items
Gas Block Diameter
  1. .750" 25 items
  2. .875" 8 items
  3. .936" 1 item
Gas System Length
  1. Blowback 1 item
  2. Pistol 6 items
  3. Carbine 2 items
  4. Mid 4 items
  5. Intermediate 3 items
  6. Rifle 14 items
  7. Rifle +1 2 items
  8. Rifle +2 4 items
Inside Diameter
  1. 1.08" 1 item
Manufacturer
  1. 21st Tec 4 items
  2. Aero Precision 1 item
  3. Boss Barrels 3 items
  4. Daniel Defense 1 item
  5. Dead Foot Arms LLC 2 items
  6. Geissele 1 item
  7. Grey Birch MFG 4 items
  8. JP Enterprises Inc 4 items
  9. KNS Precision 1 item
  10. Lewis Machine & Tool (LMT) 1 item
  11. Maxim Defense 3 items
  12. Next Level Armament 1 item
  13. Noveske 2 items
  14. Rainier Arms, LLC 58 items
  15. Sharps Bros 7 items
  16. Stern Defense 1 item
Mount
  1. M-LOK 3 items
Option
  1. AR-15 2 items
  2. JP Silent Captured Spring - Standard 1 item
  3. JP Silent Captured Spring - Heavy 1 item
  4. JP Silent Captured Spring - 9mm 1 item
  5. Buffer & Spring - Standard 1 item
  6. Buffer & Spring - H1 1 item
  7. Remington 1 item
Platform
  1. AR-10/LR308 12 items
  2. AR-15 29 items
  3. CZ 1 item
  4. Remington 700 4 items
  5. Ruger 3 items
  6. Ruger Precision Rifle 11 items
  7. Savage Small Shank 5 items
  8. Sig Cross 4 items
Product Type
  1. AR-10/LR308 Barrel 11 items
  2. AR-10 Receiver Set 1 item
  3. AR-15 Barrel 26 items
  4. AR-15 Complete Lower Receiver 1 item
  5. AR-15 Handguard 1 item
  6. AR-15 Receiver Set 2 items
  7. AR-9 Upper Receiver 1 item
  8. Bolt 2 items
  9. Bolt-Action Barrel 28 items
  10. Bolt Carrier Group 3 items
  11. Chassis 11 items
  12. Grip Accessory 1 item
  13. Stock 3 items
  14. Stock Accessory 1 item
  15. Trigger 1 item
Rail Length
  1. 5" 1 item
  2. 10" 3 items
  3. 12.43" 1 item
  4. 14" 5 items
Thread Pitch
  1. 1/2x28 (9mm) 1 item
  2. 1/2x28 (.22 cal) 7 items
  3. 5/8x24 (.30 cal) 52 items
  4. M18x1.5 1 item
Twist Rate
  1. 1:3 1 item
  2. 1:7 10 items
  3. 1:7.5 13 items
  4. 1:8 18 items
  5. 1:10 19 items
Stock Status
  1. In stock 91 items Remove This Item
  2. Out of stock 3 items
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