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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 $300.00 - $399.99 Remove This Item
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Barrel Length
  1. 5.5" 1 item
  2. 6.5" 1 item
  3. 8" 2 items
  4. 10.3" 1 item
  5. 10.5" 3 items
  6. 12" 2 items
  7. 12.5" 4 items
  8. 13.7" 1 item
  9. 14.5" 4 items
  10. 16" 10 items
  11. 18" 8 items
  12. 20" 2 items
  13. 20.5" 1 item
  14. 22" 3 items
  15. 24" 2 items
Barrel Profile
  1. MK12 SPR 2 items
  2. Non-fluted 2 items
Caliber
  1. .223/5.56 2 items
  2. .223 Wylde 2 items
  3. .308 Win 7 items
  4. .357 Magnum 2 items
  5. .44/.45 2 items
  6. .45-70 GOVT 2 items
  7. 300 Blackout 2 items
  8. 5.56 NATO 13 items
  9. 6.5 Creedmoor 9 items
  10. 6.5 Grendel 1 item
  11. 6.8 SPC 1 item
  12. 6MM Creedmoor 2 items
  13. 7.62x51 4 items
  14. 8.6 Blackout 2 items
  15. 9mm 3 items
Category
  1. Receiver Parts 16 items
  2. Parts & Kits 3 items
  3. Barrels 41 items
  4. Buffer Systems 2 items
  5. Trigger Parts 8 items
  6. Gas Systems 1 item
  7. Bolt Parts 7 items
  8. Rifle Handguards 19 items
  9. Stocks & Braces 14 items
Color
Configuration
  1. Flat 1 item
  2. M4 Curve 1 item
  3. Rifle 1 item
  4. Standard Buffer and Spring 1 item
  5. Type 1 Trunnion 1 item
  6. Type 2 Trunnion 1 item
Finish
  1. Cerakote 2 items
  2. Nitride 19 items
  3. Polished 1 item
  4. Satin 10 items
  5. Anodize 3 items
Gas Block Diameter
  1. .750" 34 items
  2. .875" 3 items
  3. .936" 1 item
Gas System Length
  1. Pistol 3 items
  2. Carbine 5 items
  3. Mid 12 items
  4. Intermediate 2 items
  5. Rifle 17 items
  6. Rifle +2 3 items
Inside Diameter
  1. 1.3" 2 items
  2. 1.39" 1 item
  3. 1.75" 1 item
Manufacturer
  1. Aero Precision 2 items
  2. Angstadt Arms 1 item
  3. Ballistic Advantage 1 item
  4. Bootleg 1 item
  5. Centurion Arms 4 items
  6. Chisel Machining 1 item
  7. Daniel Defense 2 items
  8. Dead Foot Arms LLC 4 items
  9. Faxon Firearms 4 items
  10. Form Rifle 2 items
  11. Fortis MFG 2 items
  12. Geissele 11 items
  13. Grand Power 1 item
  14. Icon Defense 2 items
  15. Jacob Grey 1 item
  16. JMAC Customs 4 items
  17. JP Enterprises Inc 6 items
  18. Knight’s Armament Company (KAC) 1 item
  19. Lewis Machine & Tool (LMT) 1 item
  20. Maxim Defense 5 items
  21. Mega Arms 1 item
  22. Midwest Industries 4 items
  23. Next Level Armament 1 item
  24. Noveske 3 items
  25. Patriot Ordnance Factory (POF) 1 item
  26. Precision Reflex Inc 1 item
  27. Q, LLC 2 items
  28. Rainier Arms, LLC 28 items
  29. RogueOps 1 item
  30. Sharps Bros 3 items
  31. Sons of Liberty Gun Works 3 items
  32. Timney Triggers 2 items
  33. V Seven Weapon Systems 4 items
Model
  1. FNH Scar 1 item
  2. Sig MCX 1 item
  3. Sig MPX 1 item
Mount
  1. M-LOK 9 items
  2. Picatinny 1 item
Option
  1. AR-9 1 item
  2. AR-10 1 item
  3. AR-15 15 items
  4. Buffer & Spring - Standard 2 items
  5. Buffer & Spring - 9mm 2 items
  6. Buffer & Spring - H1 2 items
  7. Buffer & Spring - H2 2 items
  8. Buffer & Spring - H3 2 items
  9. Sig Sauer 1 item
Platform
  1. AR-10/LR308 23 items
  2. AR-15 26 items
  3. AK47/74 4 items
  4. FNH 1 item
  5. Remington 700 1 item
  6. Sig Sauer 2 items
Product Type
  1. AR-10/LR308 Barrel 23 items
  2. AR-10 Complete Lower Receiver 1 item
  3. AR-15 Barrel 17 items
  4. AR-15 Complete Lower Receiver 3 items
  5. AR-15 Partial Upper Receiver 1 item
  6. AR-15 Handguard 12 items
  7. AR-15 Receiver Set 3 items
  8. AR-15 Stripped Lower Receiver 5 items
  9. AR-9 Receiver Set 1 item
  10. Bolt 1 item
  11. Bolt-Action Barrel 1 item
  12. Bolt Carrier Group 6 items
  13. Brace 5 items
  14. Chassis 2 items
  15. Dust Cover 1 item
  16. Handguard 8 items
  17. Parts Kit 2 items
  18. Silent Captured Spring 1 item
  19. Stock 9 items
  20. Stock Accessory 1 item
  21. Trigger 8 items
Rail Length
  1. 5.99" 1 item
  2. 7" 1 item
  3. 8" 1 item
  4. 9" 2 items
  5. 9.2" 1 item
  6. 9.3" 1 item
  7. 9.5" 1 item
  8. 9.75" 1 item
  9. 10.5" 2 items
  10. 10.64" 2 items
  11. 10.75" 1 item
  12. 11" 3 items
  13. 11.8" 1 item
  14. 12" 1 item
  15. 12.5" 1 item
  16. 13" 1 item
  17. 13.5" 4 items
  18. 13.6" 4 items
  19. 13.625" 1 item
  20. 13.75" 1 item
  21. 15" 8 items
  22. 16.5" 2 items
  23. 18" 1 item
Thread Pitch
  1. 1/2x28 (9mm) 1 item
  2. 1/2x28 (.22 cal) 15 items
  3. 5/8x24 (.30 cal) 26 items
  4. M18x1.5 1 item
Threaded
  1. Yes 2 items
Twist Rate
  1. 1:3 2 items
  2. 1:7 13 items
  3. 1:7.5 2 items
  4. 1:8 13 items
  5. 1:10 11 items
Stock Status
  1. In stock 107 items Remove This Item
  2. Out of stock 3 items
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