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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. Midwest Industries AK Drop-In Universal M-LOK Handguard
    Midwest Industries AK Drop-In Universal M-LOK Handguard
    $110.95
  2. Battle Arms Development M-Lok Micro Handstop
    Battle Arms Development M-Lok Micro Handstop
    $14.99
  3. Ergo M-Lok Enhanced Angle Grip
    Ergo M-Lok Enhanced Angle Grip
    $40.00
  4. Ergo M-Lok Hand Stop / Barricade Stop - Black
    Ergo M-Lok Hand Stop / Barricade Stop - Black
    $40.00
  5. ERGO 4 Slot M-LOK Slot Cover 4 Pack
    ERGO 4 Slot M-LOK Slot Cover 4 Pack
  6. Fortis MFG Shift Fore-End Vertical Grip M-LOK
    Fortis MFG Shift Fore-End Vertical Grip M-LOK
    $56.95
  7. Magpul Rail Cover M-LOK Type 1
    Magpul Rail Cover M-LOK Type 1
  8. Magpul M-LOK Aluminum Rail Section
    Magpul M-LOK Aluminum Rail Section
  9. SLR M-LOK RAIL SECTION
    SLR M-LOK RAIL SECTION
  10. Daniel Defense MK18 RIII Complete Upper Receiver - 10.3" FDE
    Daniel Defense MK18 RIII Complete Upper Receiver - 10.3" FDE
    $1,412.00
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