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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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Items 17-32 of 74

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  2. Magpul M-LOK Aluminum Rail Section
    Magpul M-LOK Aluminum Rail Section
    Out of stock
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  3. SLR M-LOK RAIL SECTION
    SLR M-LOK RAIL SECTION
    Out of stock
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  4. Ribbons Pre Order Noveske NSR GEN 3 AR-15 Handguard - 15"
    Noveske NSR GEN 3 AR-15 Handguard - 15"
    $280.25
    Out of stock
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  5. Ribbons Pre Order Noveske NSR GEN 3 AR-15 Handguard - 11.1"
    Noveske NSR GEN 3 AR-15 Handguard - 11.1"
    $261.25
    Out of stock
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  7. Ribbons Pre Order Noveske NSR GEN 3 AR-15 Handguard - 7.2"
    Noveske NSR GEN 3 AR-15 Handguard - 7.2"
    $242.25
    Out of stock
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  9. Daniel Defense MK18 RIII Complete Upper Receiver - 10.3" FDE
    Daniel Defense MK18 RIII Complete Upper Receiver - 10.3" FDE
    $1,412.00
    Out of stock
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  10. Next Level Armament NLX-HS M-LOK Handstop
    Next Level Armament NLX-HS M-LOK Handstop
    $29.00
    Out of stock
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  11. Rainier Arms RUC DI 300BLK Partial Upper Receiver - 10.7"
    Rainier Arms RUC DI 300BLK Partial Upper Receiver - 10.7"
    Special Price $400.00 Regular Price $500.00
    Out of stock
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  13. Midwest Industries AK Alpha Series M-LOK Handguard - 10"
    Midwest Industries AK Alpha Series M-LOK Handguard - 10"
    $219.95
    Out of stock
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  15. Kinetic Development Group Kinect MLOK 7 Slot
    Kinetic Development Group Kinect MLOK 7 Slot
    $69.81
    Out of stock
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  16. AeroKnox Hook-Stop MLOK
    AeroKnox Hook-Stop MLOK
    $42.50
    Out of stock
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Items 17-32 of 74

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  1. Mount M-LOK Remove This Item
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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
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  5. 1.55" 1 item
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  8. Chisel Machining 1 item
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  10. Daniel Defense 1 item
  11. Drew Meyers Defense 1 item
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  15. Forward Controls Design 1 item
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  27. Rainier Arms, LLC 3 items
  28. Sig Sauer 1 item
  29. Sionics Weapon Systems 1 item
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  32. V Seven Weapon Systems 1 item
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  2. AR-15 17 items
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  3. Sig Sauer 1 item
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  1. $0.00 - $999.99 66 items
  2. $1,000.00 and above 8 items
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  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 12 items
  10. Handstop 10 items
  11. Rail Cover 1 item
  12. Rail Section 1 item
  13. Sling Mount 2 items
  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
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  28. 15.3" 1 item
  29. 16" 1 item
  30. 16.5" 1 item
  31. 17" 1 item
  32. 18" 1 item
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  2. 5 Slot 2 items
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  4. 9 Slot 2 items
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  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
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  1. Out of stock 74 items Remove This Item
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