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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. Fortis MFG AR-15 REV 2.0 Free Float Rail System - FDE
    Fortis MFG AR-15 REV 2.0 Free Float Rail System - FDE
    Out of stock
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  2. Fortis MFG AR-15 REV 2.0 Free Float Rail System - OD Green
    Fortis MFG AR-15 REV 2.0 Free Float Rail System - OD Green
    Out of stock
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  3. Aeroknox AX // Foregrip - M-LOK
    Aeroknox AX // Foregrip - M-LOK
    $50.00
    Out of stock
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  4. Ballistic Advantage AR-15 Enhanced Lower Receiver
    Ballistic Advantage AR-15 Enhanced Lower Receiver
    $90.24
    Out of stock
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  5. Ballistic Advantage AR-15 Stripped Lower Receiver
    Ballistic Advantage AR-15 Stripped Lower Receiver
    $80.75
    Out of stock
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  6. Ballistic Advantage AR-15 Upper Receiver w/ Logo
    Ballistic Advantage AR-15 Upper Receiver w/ Logo
    $90.25
    Out of stock
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  7. Ballistic Advantage AR-15 Enhanced Upper Receiver
    Ballistic Advantage AR-15 Enhanced Upper Receiver
    $113.99
    Out of stock
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  8. Ballistic Advantage BA-10 Upper Receiver
    Ballistic Advantage BA-10 Upper Receiver
    $142.50
    Out of stock
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  9. Faxon Firearms FF-22 Receiver for Ruger 10/22
    Faxon Firearms FF-22 Receiver for Ruger 10/22
    $170.20
    Out of stock
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  10. Centurion Arms CM4 5.56 Forged Upper Receiver
    Centurion Arms CM4 5.56 Forged Upper Receiver
    $109.25
    Out of stock
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  11. Blackout Defense Quantum Mark 2 AR15 Stripped Upper Receiver
    Blackout Defense Quantum Mark 2 AR15 Stripped Upper Receiver
    $224.99
    Out of stock
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  12. A3 Tactical Aluminum Modular Vertical Foregrip w/ Integrated Hand Stop - Picatinny Grenade Grip
    A3 Tactical Aluminum Modular Vertical Foregrip w/ Integrated Hand Stop - Picatinny Grenade Grip
    $99.95
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  13. A3 Tactical Aluminum Compact Modular Vertical Foregrip w/ Integrated Hand Stop - M-Lok HK Grooved Grip
    A3 Tactical Aluminum Compact Modular Vertical Foregrip w/ Integrated Hand Stop - M-Lok HK Grooved Grip
    $85.45
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  14. Rainier Arms Exclusive Rainier Arms / Rellim Arms AR-15 .223 Wylde Take Down Upper Receiver Assembly - 8.5"
    Rainier Arms / Rellim Arms AR-15 .223 Wylde Take Down Upper Receiver Assembly - 8.5"
    $1,199.99
    Out of stock
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  15. Rainier Arms Exclusive Rainier Arms / Rellim Arms AR-15 5.56 NATO Take Down Upper Receiver Assembly - 16"
    Rainier Arms / Rellim Arms AR-15 5.56 NATO Take Down Upper Receiver Assembly - 16"
    $1,199.99
    Out of stock
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  16. Daniel Defense DD4 RIII S 5.56 Nato Complete Upper Receiver - 11.5" FDE
    Daniel Defense DD4 RIII S 5.56 Nato Complete Upper Receiver - 11.5" FDE
    $1,412.00
    Out of stock
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