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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 Billet Carbon Fiber Dust Cover
    Fortis MFG AR-15 Billet Carbon Fiber Dust Cover
    $37.95 - $39.95
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  3. Fortis MFG Hammer Sig Sauer MCX Charging Handle
    Fortis MFG Hammer Sig Sauer MCX Charging Handle
    $56.95
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  4. Fortis MFG Contractor Series Billet Magazine Catch
    Fortis MFG Contractor Series Billet Magazine Catch
    $18.95
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  5. Fortis MFG AR-15 Billet Dust Cover
    Fortis MFG AR-15 Billet Dust Cover
    $28.45
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  8. Fortis MFG Muzzle Brake 5.56
    Fortis MFG Muzzle Brake 5.56
    $75.95
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  12. Fortis MFG SS FIFTY Safety Selector (50 & 90 Degree) - SHIELD
    Fortis MFG SS FIFTY Safety Selector (50 & 90 Degree) - SHIELD
    $47.45
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  13. Fortis MFG SLS FIFTY Safety Selector (50 & 90 Degree) - SKEL
    Fortis MFG SLS FIFTY Safety Selector (50 & 90 Degree) - SKEL
    $47.45
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  15. Fortis MFG LE AR15 End Plate & K1 Castle Nut
    Fortis MFG LE AR15 End Plate & K1 Castle Nut
    $37.95 - $44.60
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  16. Fortis MFG AR15/AR10 Billet Magazine Release Button
    Fortis MFG AR15/AR10 Billet Magazine Release Button
    $6.60
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