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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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  6. NorthTech Defense Titanium Forward Assist
    NorthTech Defense Titanium Forward Assist
    $47.45
    Out of stock
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  7. Rainier Arms Forged Mil-Spec Upper Receiver
    Rainier Arms Forged Mil-Spec Upper Receiver
    $125.00
    Out of stock
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  8. JP Enterprises .936 Adjustable Bull Barrel Gas Block
    JP Enterprises .936 Adjustable Bull Barrel Gas Block
    $75.95
    Out of stock
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  9. Magpul MOE Rail Pieces 9 Slot - Black
    Magpul MOE Rail Pieces 9 Slot - Black
    $9.45
    Out of stock
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  10. Magpul BAD Lever
    Magpul BAD Lever
    $31.30
    Out of stock
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  12. Rainier Arms MK12 223 Wylde Partial Upper Receiver - 18"
    Rainier Arms MK12 223 Wylde Partial Upper Receiver - 18"
    $1,050.00
    Out of stock
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  16. Noveske AR-15 N4 5.56 NATO SPR Upper - 18"
    Noveske AR-15 N4 5.56 NATO SPR Upper - 18"
    $1,543.75
    Out of stock
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Items 65-80 of 80

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  1. Barrel Length 18" Remove This Item
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Barrel Profile
  1. Lightweight 2 items
  2. MK12 SPR 12 items
Caliber
  1. .22 ARC 3 items
  2. .223 Wylde 14 items
  3. .308 Win 6 items
  4. .45 ACP 1 item
  5. 5.56 NATO 7 items
  6. 6mm ARC 7 items
  7. 6.5 Creedmoor 10 items
  8. 6.5 Grendel 6 items
  9. 6MM Creedmoor 7 items
  10. 7.62x51 1 item
Category
  1. Receiver Parts 7 items
  2. Parts & Kits 5 items
  3. Barrels 57 items
  4. Gas Systems 1 item
  5. Muzzle Devices 1 item
  6. Bolt Parts 2 items
  7. Rifle Handguards 5 items
  8. Stocks & Braces 2 items
Color
Configuration
  1. AR-15 12 items
Finish
  1. Nitride 12 items
  2. Phosphate 1 item
  3. Polished 13 items
  4. Satin 22 items
Gas Block Diameter
  1. .625" 3 items
  2. .750" 36 items
  3. .875" 7 items
Gas System Length
  1. Mid 2 items
  2. Intermediate 20 items
  3. Rifle 39 items
  4. Rifle +1 3 items
Manufacturer
  1. Ballistic Advantage 6 items
  2. Boss Barrels 2 items
  3. Bravo Company MFG (BCM) 2 items
  4. Centurion Arms 1 item
  5. Faxon Firearms 4 items
  6. JP Enterprises Inc 4 items
  7. KNS Precision 1 item
  8. Magpul Industries 7 items
  9. Noveske 6 items
  10. Rainier Arms, LLC 45 items
  11. Rise Armament 1 item
Mount
  1. M-LOK 2 items
  2. Picatinny 18 items
Option
  1. AR-10 7 items
  2. AR-15 10 items
  3. Adjustable 1 item
Platform
  1. AR-10/LR308 12 items
  2. AR-15 36 items
  3. Remington 700 4 items
  4. Ruger Precision Rifle 4 items
  5. Savage Small Shank 4 items
Price
  1. $0.00 - $999.99 78 items
  2. $1,000.00 and above 2 items
Product Type
  1. AR-10/LR308 Barrel 12 items
  2. AR-15 Assembled Upper Receiver 1 item
  3. AR-15 Barrel 33 items
  4. AR-15 Complete Upper Receiver 2 items
  5. AR-15 Partial Upper Receiver 2 items
  6. AR-15 Upper Receiver Group 1 item
  7. Bolt 2 items
  8. Bolt-Action Barrel 12 items
  9. Bolt Catch 1 item
  10. Cheek Riser 2 items
  11. Flash Hider 1 item
  12. Forearm Accesory 5 items
  13. Gas Block 1 item
  14. Lower Parts Kit 1 item
  15. Take Down / Pivot Pins 2 items
Rail Length
  1. 12" 18 items
  2. 12.5" 1 item
  3. 15" 1 item
  4. 15.25" 1 item
Size
  1. 9 Slot 11 items
Thread Pitch
  1. 1/2x28 (.22 cal) 24 items
  2. 5/8x24 (.30 cal) 38 items
Threaded
  1. Yes 2 items
Twist Rate
  1. 1:7 11 items
  2. 1:7.5 15 items
  3. 1:8 26 items
  4. 1:10 8 items
Stock Status
  1. In stock 52 items
  2. Out of stock 28 items
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