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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. Battle Arms Development M-Lok Micro Handstop
    Battle Arms Development M-Lok Micro Handstop
    $14.99
    Out of stock
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  2. Ergo M-Lok Enhanced Angle Grip
    Ergo M-Lok Enhanced Angle Grip
    $40.00
    Out of stock
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  3. Ergo M-Lok Hand Stop / Barricade Stop - Black
    Ergo M-Lok Hand Stop / Barricade Stop - Black
    $40.00
    Out of stock
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  4. Maxim Defense MDX 505 PDX 300BLK Mil-Spec Complete Upper - 5.5" Urban Grey
    Maxim Defense MDX 505 PDX 300BLK Mil-Spec Complete Upper - 5.5" Urban Grey
    $1,165.50
    Out of stock
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  5. Maxim Defense MDX 505 PDX 7.62x39 Mil-Spec Complete Upper - 5.5" Urban Grey
    Maxim Defense MDX 505 PDX 7.62x39 Mil-Spec Complete Upper - 5.5" Urban Grey
    $1,165.50
    Out of stock
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  6. Maxim Defense MDX 505 PDX 5.56 NATO Mil-Spec Complete Upper - 5.5" Urban Grey
    Maxim Defense MDX 505 PDX 5.56 NATO Mil-Spec Complete Upper - 5.5" Urban Grey
    $1,165.50
    Out of stock
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  7. Midwest Industries AK Drop-In Universal M-LOK Handguard
    Midwest Industries AK Drop-In Universal M-LOK Handguard
    $110.95
    Out of stock
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  8. Cross Machine Tool (CMT) Tactical AR-15 UHPR MOD 2 HDX HANDGUARD
    Cross Machine Tool (CMT) Tactical AR-15 UHPR MOD 2 HDX HANDGUARD
    Out of stock
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  9. Cross Machine Tool (CMT) Tactical UHPR MOD-1 HDX AR15 Handguard
    Cross Machine Tool (CMT) Tactical UHPR MOD-1 HDX AR15 Handguard
    Out of stock
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  10. Midwest Industries MCX Virtus M-LOK Handguard
    Midwest Industries MCX Virtus M-LOK Handguard
    Out of stock
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  11. Angstadt Arms Ultralight M-LOK Handguard
    Angstadt Arms Ultralight M-LOK Handguard
    Out of stock
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  12. Cross Machine Tool (CMT) Tactical UHPR MOD 3 HDX QUAD RAIL
    Cross Machine Tool (CMT) Tactical UHPR MOD 3 HDX QUAD RAIL
    Out of stock
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  13. Maxim Defense MDX 508 5.56 Mil-Spec Complete Upper - 8.5"
    Maxim Defense MDX 508 5.56 Mil-Spec Complete Upper - 8.5"
    Out of stock
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  14. Midwest Industries Henry 30-30 Extended Sight System MLOK Handguard
    Midwest Industries Henry 30-30 Extended Sight System MLOK Handguard
    $299.95
    Out of stock
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  15. Daniel Defense MK18 RIII Complete Upper Receiver - 10.3" FDE
    Daniel Defense MK18 RIII Complete Upper Receiver - 10.3" FDE
    $1,412.00
    Out of stock
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  16. Midwest Industries Marlin 1895 Extended Sight System MLOK Handguard
    Midwest Industries Marlin 1895 Extended Sight System MLOK Handguard
    $314.95
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Items 17-32 of 67

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