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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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Barrel Length
  1. 5.5" 3 items
  2. 8.5" 1 item
  3. 10.3" 1 item
  4. 10.5" 4 items
  5. 10.7" 1 item
  6. 13.7" 2 items
  7. 14.5" 1 item
  8. 16" 4 items
  9. 18" 1 item
Barrel Profile
  1. Non-fluted 1 item
Caliber
  1. .223/5.56 1 item
  2. .30-30 1 item
  3. .308 1 item
  4. 300 Blackout 3 items
  5. 5.56 NATO 10 items
  6. 7.62x39 1 item
Category
  1. Receiver Parts 17 items
  2. Grips 18 items
  3. Rifle Handguards 39 items
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Configuration
  1. M-LOK 2 items
Finish
  1. Arid 1 item
  2. Anodize 4 items
Gas Block Diameter
  1. .750" 5 items
Gas System Length
  1. Carbine 3 items
  2. Mid 5 items
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.3" 1 item
  2. 1.315" 3 items
  3. 1.42" 1 item
  4. 1.45" 1 item
  5. 1.55" 1 item
Manufacturer
  1. A3 Tactical 1 item
  2. Aero Precision 1 item
  3. Aeroknox 3 items
  4. Angstadt Arms 1 item
  5. B5 Systems 1 item
  6. Battle Arms Development 2 items
  7. Bravo Company MFG (BCM) 5 items
  8. Chisel Machining 1 item
  9. Cross Machine Tool (CMT) 4 items
  10. Daniel Defense 1 item
  11. Drew Meyers Defense 1 item
  12. Ergo Grips 3 items
  13. Faxon Firearms 1 item
  14. Fortis MFG 2 items
  15. Geissele 1 item
  16. JMAC Customs 2 items
  17. Kinetic Development Group 2 items
  18. Knight’s Armament Company (KAC) 2 items
  19. Kratos Design Group 1 item
  20. Lewis Machine & Tool (LMT) 2 items
  21. Magpul Industries 2 items
  22. Maxim Defense 4 items
  23. Midwest Industries 7 items
  24. Next Level Armament 1 item
  25. Noveske 10 items
  26. Rainier Arms, LLC 3 items
  27. Sig Sauer 1 item
  28. Sionics Weapon Systems 1 item
  29. SLR Rifleworks 1 item
  30. Sons of Liberty Gun Works 4 items
  31. V Seven Weapon Systems 1 item
  32. VKTR Industries 1 item
  33. VLTOR 1 item
Model
  1. Sig MCX 1 item
Option
  1. AR-10 1 item
  2. AR-15 17 items
Platform
  1. AR-15 13 items
  2. AK47/74 1 item
  3. Sig Sauer 1 item
Product Type
  1. Accessory 1 item
  2. Angled Grip 2 items
  3. AR-10 Handguard 1 item
  4. AR-15 Complete Upper Receiver 9 items
  5. AR-15 Partial Upper Receiver 7 items
  6. AR-15 Handguard 20 items
  7. Complete Upper 1 item
  8. Forearm Accesory 3 items
  9. Handguard 13 items
  10. Handstop 10 items
  11. Rail Cover 1 item
  12. Rail Section 1 item
  13. Sling Mount 1 item
  14. Vertical Grip 6 items
Rail Length
  1. 3" 1 item
  2. 4" 1 item
  3. 5.5" 1 item
  4. 6.0" 2 items
  5. 6.7" 3 items
  6. 7" 3 items
  7. 7.2" 1 item
  8. 8.25" 1 item
  9. 9" 2 items
  10. 9.5" 7 items
  11. 9.6" 1 item
  12. 9.75" 1 item
  13. 10" 2 items
  14. 10.5" 3 items
  15. 10.75" 1 item
  16. 11.1" 1 item
  17. 11.5" 2 items
  18. 12" 2 items
  19. 12.4" 1 item
  20. 12.5" 1 item
  21. 13" 4 items
  22. 13.5" 2 items
  23. 13.625" 1 item
  24. 13.7" 4 items
  25. 13.8" 1 item
  26. 14" 1 item
  27. 15" 15 items
  28. 15.3" 1 item
  29. 16" 1 item
  30. 16.5" 1 item
  31. 17" 1 item
  32. 18" 1 item
Size
  1. 3 Slot 2 items
  2. 5 Slot 2 items
  3. 7 Slot 2 items
  4. 9 Slot 2 items
Thread Pitch
  1. 1/2x28 (.22 cal) 6 items
  2. 5/8x24 (.30 cal) 2 items
Threaded
  1. Yes 6 items
Twist Rate
  1. 1:7 8 items
  2. 1:8 1 item
Stock Status
  1. In stock 1 item
  2. Out of stock 73 items Remove This Item
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