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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. Noveske Lo Pro Gas Block .625
    Noveske Lo Pro Gas Block .625
    $60.00
    Out of stock
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  2. Ascalon Arms CZ Scorpion EVO 3/3+ Folding Charging Handle - Grey
    Ascalon Arms CZ Scorpion EVO 3/3+ Folding Charging Handle - Grey
    $69.00
    Out of stock
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  3. Aeroknox Rail Grips - M-Lok
    Aeroknox Rail Grips - M-Lok
    $60.00
    Out of stock
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  4. Rainier Arms Ambidextrous (50 & 90 Degree) MOD 2 Safety Selector Switch
    Rainier Arms Ambidextrous (50 & 90 Degree) MOD 2 Safety Selector Switch
    Out of stock
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  5. Springer Precision MPX Aluminum Magwell
    Springer Precision MPX Aluminum Magwell
    Out of stock
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  6. Kinetic Development Group Kinect MLOK 7 Slot
    Kinetic Development Group Kinect MLOK 7 Slot
    $69.81
    Out of stock
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  7. Faxon Firearms 6.5 Grendel 9310 Bolt- Nitride
    Faxon Firearms 6.5 Grendel 9310 Bolt- Nitride
    $68.99
    Out of stock
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  8. Armaspec Gun Builder's Lower Parts Kit - Black
    Armaspec Gun Builder's Lower Parts Kit - Black
    $67.49
    Out of stock
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  9. ALG Defense Quality Mil-Spec Trigger - QMS
    ALG Defense Quality Mil-Spec Trigger - QMS
    $68.25
    Out of stock
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  10. Battle Arms Development Lightweight Butt Stock for Mil Spec Buffer Tube
    Battle Arms Development Lightweight Butt Stock for Mil Spec Buffer Tube
    $69.00
    Out of stock
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  11. Hera Arms LC-S Linear Compensator-Small
    Hera Arms LC-S Linear Compensator-Small
    $69.00
    Out of stock
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  12. Battle Arms Development Lightweight Low Profile Titanium Gas Block-Raw Titanium Finish
    Battle Arms Development Lightweight Low Profile Titanium Gas Block-Raw Titanium Finish
    Out of stock
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  13. Knight's Armament Company (KAC) M-LOK Index Stop
    Knight's Armament Company (KAC) M-LOK Index Stop
    $62.37
    Out of stock
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  14. Forward Controls Design REF Carbine Receiver Extension - Black
    Forward Controls Design REF Carbine Receiver Extension - Black
    $66.50
    Out of stock
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  8. Buffer Kit 1 item
  9. Buffer Tube 2 items
  10. Castle Nut / End Plate 1 item
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  20. Handstop 3 items
  21. Lower Parts Kit 2 items
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