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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. Lewis Machine & Tool (LMT) AR-15 5.56 Semi Auto G2 Piston Bolt Carrier Group
    Lewis Machine & Tool (LMT) AR-15 5.56 Semi Auto G2 Piston Bolt Carrier Group
    $429.00
    Out of stock
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  2. Lewis Machine & Tool (LMT) AR-15 MRP Chrome Lined 5.56 Piston Barrel - 12"
    Lewis Machine & Tool (LMT) AR-15 MRP Chrome Lined 5.56 Piston Barrel - 12"
    $709.00
    Out of stock
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  3. Lewis Machine & Tool (LMT) AR-15 FSB 5.56 Barreled Upper Receiver - 14.5"
    Lewis Machine & Tool (LMT) AR-15 FSB 5.56 Barreled Upper Receiver - 14.5"
    $699.00
    Out of stock
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  4. Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 16"
    $855.00
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  5. Triggertech AR-15 Single Stage Duty Trigger
    Triggertech AR-15 Single Stage Duty Trigger
    Out of stock
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  6. Triggertech AR-15 Two Stage Duty Trigger
    Triggertech AR-15 Two Stage Duty Trigger
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  7. Sons of Liberty Gun Works M4-EXO3 300 BLK AR-15 Upper - 10.5"
    Sons of Liberty Gun Works M4-EXO3 300 BLK AR-15 Upper - 10.5"
    $712.50
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  8. Sons of Liberty Gun Works M4-EXO3 5.56 AR-15 Upper - 13.7"
    Sons of Liberty Gun Works M4-EXO3 5.56 AR-15 Upper - 13.7"
    $807.50
    Out of stock
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  9. Angstadt Arms AR-15 5.56 Complete Upper Assembly - 16"
    Angstadt Arms AR-15 5.56 Complete Upper Assembly - 16"
    $404.00
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  10. Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 13.7"
    Sons of Liberty Gun Works M4-89 5.56 AR-15 Upper - 13.7"
    $950.00
    Out of stock
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  11. Obsidian Arms Enhanced AR-15 Bolt Carrier Pin Kit
    Obsidian Arms Enhanced AR-15 Bolt Carrier Pin Kit
    $19.00
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  12. Lewis Machine & Tool (LMT) AR-15 5.56 Full Auto G2 Piston Bolt Carrier Group
    Lewis Machine & Tool (LMT) AR-15 5.56 Full Auto G2 Piston Bolt Carrier Group
    $429.10
    Out of stock
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  13. Lewis Machine & Tool (LMT) Sopmod Buttstock - Black
    Lewis Machine & Tool (LMT) Sopmod Buttstock - Black
    $209.00
    Out of stock
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  14. Noveske AR-15 Gen 4 Ambidextrous Matched Upper & Lower Receiver Set
    Noveske AR-15 Gen 4 Ambidextrous Matched Upper & Lower Receiver Set
    $750.00
    Out of stock
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  15. Rainier Arms Exclusive Foxtrot Mike (FM) Products AR-15 5.56MM FM-15 Gen 2 Complete Upper Receiver - 13.9" (Rainier Arms Exclusive)
    Foxtrot Mike (FM) Products AR-15 5.56MM FM-15 Gen 2 Complete Upper Receiver - 13.9" (Rainier Arms Exclusive)
    Special Price $599.99 Regular Price $659.95
    Out of stock
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  16. Bravo Company MFG (BCM) MK2 BFH 5.56 NATO Mid-Length Upper Receiver Group w/ MCMR-13 Handguard - 14.5"
    Bravo Company MFG (BCM) MK2 BFH 5.56 NATO Mid-Length Upper Receiver Group w/ MCMR-13 Handguard - 14.5"
    $794.99
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