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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. Mount M-LOK Remove This Item
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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 10 items
  2. Grips 19 items
  3. Rifle Handguards 37 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) 4 items
  8. Cross Machine Tool (CMT) 4 items
  9. Drew Meyers Defense 1 item
  10. Ergo Grips 3 items
  11. Faxon Firearms 1 item
  12. Fortis MFG 2 items
  13. Forward Controls Design 1 item
  14. Geissele 2 items
  15. JMAC Customs 1 item
  16. Kinetic Development Group 2 items
  17. Knight’s Armament Company (KAC) 2 items
  18. Lewis Machine & Tool (LMT) 1 item
  19. Magpul Industries 2 items
  20. Midwest Industries 7 items
  21. Next Level Armament 1 item
  22. Noveske 7 items
  23. Rainier Arms, LLC 3 items
  24. Sharps Bros 2 items
  25. Sig Sauer 1 item
  26. Sionics Weapon Systems 1 item
  27. SLR Rifleworks 1 item
  28. Sons of Liberty Gun Works 4 items
  29. True North Concepts 2 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 9 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 6 items
  6. AR-15 Handguard 19 items
  7. Chassis 2 items
  8. Forearm Accesory 3 items
  9. Handguard 11 items
  10. Handstop 10 items
  11. Rail Cover 1 item
  12. Rail Section 1 item
  13. Sling Mount 2 items
  14. Vertical Grip 7 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. 9.3" 1 item
  11. 9.5" 6 items
  12. 9.6" 1 item
  13. 10" 2 items
  14. 10.5" 3 items
  15. 10.75" 1 item
  16. 11.1" 1 item
  17. 11.5" 1 item
  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" 3 items
  27. 15" 14 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) 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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