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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 49-64 of 69

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  1. Ballistic Advantage AR-15 Enhanced Upper Receiver
    Ballistic Advantage AR-15 Enhanced Upper Receiver
    $113.99
    Out of stock
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  2. Ballistic Advantage BA-10 Upper Receiver
    Ballistic Advantage BA-10 Upper Receiver
    $142.50
    Out of stock
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  3. 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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  4. Blackout Defense Quantum Mark 2 AR15 Stripped Upper Receiver
    Blackout Defense Quantum Mark 2 AR15 Stripped Upper Receiver
    $224.99
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  5. A3 Tactical Aluminum Compact Modular Vertical Foregrip w/ Integrated Hand Stop - M-Lok Grenade Grip
    A3 Tactical Aluminum Compact Modular Vertical Foregrip w/ Integrated Hand Stop - M-Lok Grenade Grip
    $85.45
    Out of stock
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  6. 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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  7. 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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  8. 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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  9. 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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  10. 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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  11. Grey Birch MFG La Chassis System for CZ 457 - Right Hand
    Grey Birch MFG La Chassis System for CZ 457 - Right Hand
    $499.99
    Out of stock
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  12. Grey Birch MFG La Chassis System for Tikka T1X - Right Hand
    Grey Birch MFG La Chassis System for Tikka T1X - Right Hand
    $499.99
    Out of stock
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  13. Faxon Firearms AR-15 G3 STREAMLINE Aluminum M-LOK Handguard - 13"
    Faxon Firearms AR-15 G3 STREAMLINE Aluminum M-LOK Handguard - 13"
    $165.60
    Out of stock
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  14. 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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  15. 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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  16. 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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Items 49-64 of 69

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  16. Chassis 3 items
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  20. Forearm Accesory 1 item
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