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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. Krebs Custom Safety for Kalashnikov USA KP-9 Pistol
    Krebs Custom Safety for Kalashnikov USA KP-9 Pistol
    $62.00
    Out of stock
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  2. Krebs Custom Yugo AMBI Safety
    Krebs Custom Yugo AMBI Safety
    $66.50
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  3. Aero Precision AR-15 Carbine Buffer Kit
    Aero Precision AR-15 Carbine Buffer Kit
    $67.99
    Out of stock
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  4. Noveske Lo Pro Gas Block .750 2 Screw
    Noveske Lo Pro Gas Block .750 2 Screw
    $61.75
    Out of stock
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  5. Aeroknox Rail Grips - M-Lok
    Aeroknox Rail Grips - M-Lok
    $60.00
    Out of stock
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  6. Springer Precision MPX Aluminum Magwell
    Springer Precision MPX Aluminum Magwell
    Out of stock
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  7. Kinetic Development Group Kinect MLOK 7 Slot
    Kinetic Development Group Kinect MLOK 7 Slot
    $69.81
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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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  10. Timney Triggers AR 49ER Ambidextrous Safety Selector
    Timney Triggers AR 49ER Ambidextrous Safety Selector
    Special Price $66.99 Regular Price $80.99
    Out of stock
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  11. V Seven Weapon Systems Endplate / Castle Nut Combo
    V Seven Weapon Systems Endplate / Castle Nut Combo
    $61.11
    Out of stock
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  12. V Seven Weapon Systems Carbine Buffer Tube
    V Seven Weapon Systems Carbine Buffer Tube
    $63.05
    Out of stock
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  13. V Seven Weapon Systems Titanium Barrel Nut for BCM KMR
    V Seven Weapon Systems Titanium Barrel Nut for BCM KMR
    $68.87
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  16. Hera Arms LC-S Linear Compensator-Small
    Hera Arms LC-S Linear Compensator-Small
    $69.00
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  1. Parts & Kits 10 items
  2. Buffer Systems 3 items
  3. Gas Systems 3 items
  4. Muzzle Devices 1 item
  5. Grips 3 items
  6. Charging Handles 3 items
  7. Rifle Handguards 3 items
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  14. Magpul Industries 1 item
  15. Next Level Armament 1 item
  16. Noveske 1 item
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  18. Sons of Liberty Gun Works 1 item
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  14. Sling Mount 1 item
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  1. 7" 1 item
  2. 9.25" 1 item
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  1. 7 Slot 1 item
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