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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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  2. Sig Sauer TREAD Vertical M-LOK Grip Kit
    Sig Sauer TREAD Vertical M-LOK Grip Kit
    Special Price $37.99 Regular Price $49.99
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  3. Forward Controls Design PCM Cable Management Panel
    Forward Controls Design PCM Cable Management Panel
    $28.50
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  5. Fortis MFG Shift Short Angled Grip M-LOK
    Fortis MFG Shift Short Angled Grip M-LOK
    $47.45
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  15. Unity Tactical VFG M-LOK Vertical Grip
    Unity Tactical VFG M-LOK Vertical Grip
    $24.00
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  16. Arisaka Defense M-Lok Hand Stop
    Arisaka Defense M-Lok Hand Stop
    $30.00 - $33.00
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Items 1-16 of 134

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Barrel Length
  1. 5.5" 2 items
  2. 7.5" 2 items
  3. 10.3" 4 items
  4. 10.5" 5 items
  5. 10.7" 1 item
  6. 11.5" 1 item
  7. 12.5" 1 item
  8. 13.7" 1 item
  9. 14.5" 3 items
  10. 16" 5 items
  11. 17" 1 item
Barrel Profile
  1. Non-fluted 1 item
Caliber
  1. 300 Blackout 1 item
  2. 5.56 NATO 11 items
  3. 9mm 2 items
Category
  1. Receiver Parts 22 items
  2. Gas Systems 1 item
  3. Grips 42 items
  4. Rifle Handguards 68 items
  5. Stocks & Braces 3 items
Color
Configuration
  1. AR-15 3 items
  2. M-LOK 1 item
Finish
  1. Black 1 item
  2. Carbon Fiber 1 item
  3. FDE 1 item
  4. Phosphate 1 item
  5. Anodize 8 items
Gas Block Diameter
  1. .750" 6 items
Gas Length
  1. Carbine 4 items
  2. Mid 5 items
Height
  1. Absolute Co-Witness 3 items
Inside Diameter
  1. 1.15" 1 item
  2. 1.3" 6 items
  3. 1.31" 1 item
  4. 1.34" 3 items
  5. 1.39" 1 item
  6. 1.54" 1 item
Is Firearms?
  1. No 134 items
Manufacturer
  1. A3 Tactical 5 items
  2. Aero Precision 2 items
  3. Arisaka 3 items
  4. B5 Systems 2 items
  5. Bravo Company MFG (BCM) 9 items
  6. Brigand Arms 1 item
  7. Chisel Machining 1 item
  8. Cobalt Kinetics 1 item
  9. Cross Machine Tool (CMT) 1 item
  10. Daniel Defense 5 items
  11. Drew Meyers Defense 2 items
  12. Driven Arms Co. 1 item
  13. Emissary Development 2 items
  14. F-1 Firearms 1 item
  15. Fortis MFG 7 items
  16. Forward Controls Design 7 items
  17. Geissele 4 items
  18. Griffin Armament 2 items
  19. HERA ARMS 1 item
  20. Heresy Design 1 item
  21. Icon Defense 1 item
  22. JMAC Customs 12 items
  23. Kinetic Development Group 2 items
  24. Kratos Design Group 2 items
  25. Lewis Machine & Tool (LMT) 5 items
  26. Magpul Industries 9 items
  27. Maxim Defense 3 items
  28. Midwest Industries 5 items
  29. Next Level Armament 1 item
  30. Noveske 3 items
  31. Quarter Circle 10 2 items
  32. Rainier Arms, LLC 4 items
  33. Rainier Industries 1 item
  34. Rise Armament 1 item
  35. RS Regulate 1 item
  36. Seekins Precision 1 item
  37. Sharps Bros 4 items
  38. Sig Sauer 1 item
  39. SLR Rifleworks 1 item
  40. Sons of Liberty Gun Works 5 items
  41. Strike Industries 3 items
  42. True North Concepts 6 items
  43. Unity Tactical 1 item
  44. V Seven Weapon Systems 1 item
  45. VKTR Industries 1 item
Model
  1. CZ Scorpion 2 items
  2. Sig MPX 1 item
Option
  1. AK-47/74 1 item
  2. AR-15 25 items
  3. Long 1 item
  4. CZ 2 items
  5. Sig Sauer 1 item
  6. Green Laser 1 item
Platform
  1. AR-15 19 items
  2. AK47/74 6 items
  3. CZ-USA 2 items
  4. H&K 1 item
  5. Sig Sauer 1 item
Price
  1. $0.00 - $999.99 128 items
  2. $1,000.00 - $1,999.99 3 items
  3. $2,000.00 and above 3 items
Product Type
  1. Accessory 1 item
  2. Angled Grip 6 items
  3. AR-15 Complete Upper Receiver 7 items
  4. AR-15 Partial Upper Receiver 9 items
  5. AR-15 Handguard 35 items
  6. Cable Clip 1 item
  7. Chassis 4 items
  8. Complete Upper 1 item
  9. Finger Stop 1 item
  10. Forearm Accesory 4 items
  11. Handguard 28 items
  12. Handstop 20 items
  13. Rail Adapter 1 item
  14. Rail Cover 1 item
  15. Rail Panel 2 items
  16. Sling Mount 1 item
  17. Stock 2 items
  18. Stock Adapter 1 item
  19. Vertical Grip 16 items
Rail Length
  1. 3.25" 1 item
  2. 4.25" 3 items
  3. 4.5" 2 items
  4. 4.9" 1 item
  5. 5.5" 1 item
  6. 5.99" 1 item
  7. 6.25" 2 items
  8. 6.375" 1 item
  9. 6.5" 2 items
  10. 6.7" 3 items
  11. 6.75" 2 items
  12. 7" 10 items
  13. 7.25" 1 item
  14. 7.3" 1 item
  15. 7.5" 2 items
  16. 7.8" 1 item
  17. 8" 2 items
  18. 8.6" 1 item
  19. 9" 6 items
  20. 9.25" 1 item
  21. 9.3" 2 items
  22. 9.5" 10 items
  23. 9.55" 3 items
  24. 9.59" 1 item
  25. 9.6" 3 items
  26. 10" 5 items
  27. 10.3" 1 item
  28. 10.5" 6 items
  29. 10.64" 2 items
  30. 10.7" 3 items
  31. 11" 3 items
  32. 11.5" 4 items
  33. 11.7" 3 items
  34. 11.8" 4 items
  35. 12" 2 items
  36. 12.3" 1 item
  37. 12.4" 1 item
  38. 12.5" 5 items
  39. 13" 6 items
  40. 13.25" 1 item
  41. 13.5" 10 items
  42. 13.7" 3 items
  43. 13.8" 3 items
  44. 14" 5 items
  45. 14.3" 1 item
  46. 15" 22 items
  47. 15.3" 3 items
  48. 16.3" 1 item
  49. 16.5" 2 items
  50. 17" 1 item
Size
  1. 3 Slot 1 item
  2. 5 Slot 1 item
  3. 9 Slot 1 item
Thread Pitch
  1. 1/2x28 6 items
  2. 5/8x24 1 item
Threaded
  1. Yes 5 items
Twist Rate
  1. 1:7 7 items
  2. 1:8 1 item
Stock Status
  1. In stock 134 items Remove This Item
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