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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. 10.5" 2 items
  2. 10.7" 1 item
  3. 13.7" 1 item
  4. 14.5" 1 item
  5. 16" 3 items
Barrel Profile
  1. Non-fluted 1 item
Caliber
  1. .30-30 1 item
  2. .308 1 item
  3. 300 Blackout 2 items
  4. 5.56 NATO 5 items
Category
  1. Receiver Parts 9 items
  2. Grips 18 items
  3. Rifle Handguards 39 items
Color
Configuration
  1. M-LOK 2 items
Finish
  1. Anodize 4 items
Gas Block Diameter
  1. .750" 3 items
Gas System Length
  1. Carbine 1 item
  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. Drew Meyers Defense 1 item
  11. Ergo Grips 3 items
  12. Faxon Firearms 1 item
  13. Fortis MFG 2 items
  14. Forward Controls Design 1 item
  15. Geissele 1 item
  16. JMAC Customs 1 item
  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. Midwest Industries 7 items
  23. Next Level Armament 1 item
  24. Noveske 8 items
  25. Rainier Arms, LLC 3 items
  26. Sig Sauer 1 item
  27. Sionics Weapon Systems 1 item
  28. SLR Rifleworks 1 item
  29. Sons of Liberty Gun Works 4 items
  30. V Seven Weapon Systems 1 item
  31. VLTOR 1 item
Model
  1. Sig MCX 1 item
Option
  1. AR-10 1 item
  2. AR-15 16 items
Platform
  1. AR-15 10 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 2 items
  5. AR-15 Partial Upper Receiver 7 items
  6. AR-15 Handguard 20 items
  7. Forearm Accesory 3 items
  8. Handguard 12 items
  9. Handstop 10 items
  10. Rail Cover 1 item
  11. Rail Section 1 item
  12. Sling Mount 2 items
  13. 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" 6 items
  11. 9.6" 1 item
  12. 10" 2 items
  13. 10.5" 3 items
  14. 10.75" 1 item
  15. 11.1" 1 item
  16. 11.5" 2 items
  17. 12" 2 items
  18. 12.4" 1 item
  19. 12.5" 1 item
  20. 13" 4 items
  21. 13.5" 2 items
  22. 13.625" 1 item
  23. 13.7" 4 items
  24. 13.8" 1 item
  25. 14" 1 item
  26. 15" 14 items
  27. 15.3" 1 item
  28. 16" 1 item
  29. 16.5" 1 item
  30. 17" 1 item
  31. 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) 3 items
  2. 5/8x24 (.30 cal) 1 item
Threaded
  1. Yes 4 items
Twist Rate
  1. 1:7 5 items
  2. 1:8 1 item
Stock Status
  1. Out of stock 66 items Remove This Item
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