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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. Agency Arms Benelli M2 Modular M-LOK Rail
    Agency Arms Benelli M2 Modular M-LOK Rail
    $250.00
    Out of stock
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  2. 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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  3. 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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  4. Aeroknox AX // Foregrip - M-LOK
    Aeroknox AX // Foregrip - M-LOK
    $50.00
    Out of stock
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  5. 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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  6. Geissele Ultra Duty Lower Parts Kit No Grip - Black
    Geissele Ultra Duty Lower Parts Kit No Grip - Black
    $145.00
    Out of stock
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  7. 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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  8. Primary Weapons Systems MK1 MOD 2-M AR-15 Stripped Ambidextrous Lower Receiver
    Primary Weapons Systems MK1 MOD 2-M AR-15 Stripped Ambidextrous Lower Receiver
    $279.95
    Out of stock
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  9. Aeroknox AX // 15 Handguard M-LOK
    Aeroknox AX // 15 Handguard M-LOK
    Out of stock
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  10. Angstadt Arms Ultralight M-LOK Handguard
    Angstadt Arms Ultralight M-LOK Handguard
    Out of stock
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  11. 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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  12. 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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  13. Aero Precision AR-15 M4E1 Stripped Lower Receiver - ODG Anodize
    Aero Precision AR-15 M4E1 Stripped Lower Receiver - ODG Anodize
    $139.99
    Out of stock
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  14. Aero Precision AR-15/AR-10 Enhanced Carbine Buffer Tube
    Aero Precision AR-15/AR-10 Enhanced Carbine Buffer Tube
    Out of stock
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  15. Ballistic Advantage AR-15 Enhanced Lower Receiver
    Ballistic Advantage AR-15 Enhanced Lower Receiver
    $90.24
    Out of stock
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  16. Ballistic Advantage AR-15 Stripped Lower Receiver
    Ballistic Advantage AR-15 Stripped Lower Receiver
    $80.75
    Out of stock
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