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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. Ballistic Advantage AR-15 Enhanced Lower Receiver
    Ballistic Advantage AR-15 Enhanced Lower Receiver
    $90.24
    Out of stock
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  2. Ballistic Advantage AR-15 Stripped Lower Receiver
    Ballistic Advantage AR-15 Stripped Lower Receiver
    $80.75
    Out of stock
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  3. Ballistic Advantage AR-15 Upper Receiver w/ Logo
    Ballistic Advantage AR-15 Upper Receiver w/ Logo
    $90.25
    Out of stock
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  5. Aero Precision AR-15 Carbine Buffer Kit
    Aero Precision AR-15 Carbine Buffer Kit
    $67.99
    Out of stock
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  7. VLTOR AR15 Charging Handle - Ambidextrous Latch
    VLTOR AR15 Charging Handle - Ambidextrous Latch
    $95.36
    Out of stock
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  10. Aeroknox Butterfly Brake .223/5.56
    Aeroknox Butterfly Brake .223/5.56
    $90.00
    Out of stock
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  11. Aeroknox Field Pins
    Aeroknox Field Pins
    $37.00
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  12. Faxon Firearms Stripped Forged Upper Receiver - 7075-T6
    Faxon Firearms Stripped Forged Upper Receiver - 7075-T6
    $91.99
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  14. Armaspec Gun Builder's Lower Parts Kit - Black
    Armaspec Gun Builder's Lower Parts Kit - Black
    $67.49
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  15. Troy Industries Ambidextrous Magazine Release
    Troy Industries Ambidextrous Magazine Release
    $58.00
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  16. Stag Arms A2 Pistol Grip
    Stag Arms A2 Pistol Grip
    $3.50
    Out of stock
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  1. Price $0.00 - $99.99 Remove This Item
  2. Option AR-15 Remove This Item
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Barrel Length
  1. 16" 8 items
  2. 18" 2 items
Caliber
  1. .223/5.56 2 items
  2. .308 1 item
  3. 300 Blackout 1 item
  4. 5.56 NATO 1 item
  5. 7.62x51 2 items
Category
  1. Receiver Parts 5 items
  2. Parts & Kits 13 items
  3. Buffer Systems 3 items
  4. Trigger Parts 2 items
  5. Gas Systems 1 item
  6. Muzzle Devices 3 items
  7. Bolt Parts 1 item
  8. Grips 2 items
  9. Charging Handles 4 items
  10. Rifle Handguards 2 items
  11. Stocks & Braces 2 items
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  1. AR-15 4 items
  2. M-LOK 4 items
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  3. Intermediate 2 items
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  2. Aeroknox 2 items
  3. Armaspec 1 item
  4. Arms Republic 1 item
  5. Ballistic Advantage 3 items
  6. Battle Arms Development 2 items
  7. Blitzkrieg Components 1 item
  8. Bravo Company MFG (BCM) 1 item
  9. Daniel Defense 1 item
  10. Elftmann Tactical 1 item
  11. Faxon Firearms 1 item
  12. Forward Controls Design 1 item
  13. HERA ARMS 2 items
  14. James Madison Tactical (JMT) 1 item
  15. Knight’s Armament Company (KAC) 1 item
  16. KNS Precision 1 item
  17. Magpul Industries 1 item
  18. NEMO Arms 1 item
  19. Noveske 1 item
  20. Patriot Ordnance Factory (POF) 1 item
  21. Precision Armament 1 item
  22. Sionics Weapon Systems 1 item
  23. Stag Arms 1 item
  24. Troy Industries 1 item
  25. Tyrant Designs 1 item
  26. V Seven Weapon Systems 1 item
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  28. WMD Guns 1 item
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  10. $90.00 and above 6 items
Product Type
  1. Anti Walk Pins 2 items
  2. AR-15 Assembled Upper Receiver 1 item
  3. AR-15 Charging Handle 3 items
  4. AR-15 Handguard 1 item
  5. AR-15 Stripped Lower Receiver 2 items
  6. AR-15 Stripped Upper Receiver 2 items
  7. Bolt Catch 1 item
  8. Buffer Kit 1 item
  9. Buffer Tube 2 items
  10. Cam Pin 1 item
  11. Charging Handle 1 item
  12. Compensator 1 item
  13. End Plate 1 item
  14. Flash Hider 1 item
  15. Forearm Accesory 1 item
  16. Front Sight 1 item
  17. Grip Module 1 item
  18. Lower Parts Kit 3 items
  19. Muzzle Brake 1 item
  20. Patch 1 item
  21. Safety Selector 2 items
  22. Sight Post 1 item
  23. Stock Adapter 1 item
  24. Take Down / Pivot Pins 3 items
  25. Trigger Guard 1 item
  26. Upper Parts Kit 1 item
Rail Length
  1. 7" 1 item
  2. 9.25" 1 item
  3. 10" 6 items
  4. 12" 5 items
  5. 15" 1 item
Size
  1. 9 Slot 9 items
Thread Pitch
  1. 1/2x28 (.22 cal) 2 items
  2. 5/8x24 (.30 cal) 1 item
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  1. Out of stock 40 items Remove This Item
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