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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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  3. Lewis Machine & Tool (LMT) Sopmod Buttstock - Black
    Lewis Machine & Tool (LMT) Sopmod Buttstock - Black
    $205.20
    Out of stock
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  13. ERGO AR15/M16 Tactical DLX
    ERGO AR15/M16 Tactical DLX
    Out of stock
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  14. Faxon Firearms Gunner 300BLK AR-15 QPQ Barrel - 16"
    Faxon Firearms Gunner 300BLK AR-15 QPQ Barrel - 16"
    $165.60
    Out of stock
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  15. Faxon Firearms Gunner 5.56 NATO AR-15 QPQ Barrel - 20"
    Faxon Firearms Gunner 5.56 NATO AR-15 QPQ Barrel - 20"
    $188.60
    Out of stock
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  16. Geissele AR-15 Super Charging Handle (SCH®)
    Geissele AR-15 Super Charging Handle (SCH®)
    Out of stock
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Items 113-128 of 164

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Barrel Length
  1. 5.25" 1 item
  2. 5.5" 1 item
  3. 6" 2 items
  4. 6.5" 1 item
  5. 7.25" 1 item
  6. 7.5" 2 items
  7. 8" 2 items
  8. 8.5" 3 items
  9. 9" 1 item
  10. 10" 2 items
  11. 10.5" 13 items
  12. 10.7" 1 item
  13. 11.5" 3 items
  14. 12" 5 items
  15. 12.5" 5 items
  16. 13.7" 6 items
  17. 13.9" 1 item
  18. 14.5" 6 items
  19. 16" 19 items
  20. 16.1" 1 item
  21. 18" 18 items
  22. 20" 9 items
  23. 22" 4 items
Barrel Profile
  1. Dissipator 2 items
  2. DMR 2 items
  3. MK12 SPR 7 items
Caliber
  1. .22 ARC 4 items
  2. .223 Wylde 19 items
  3. 300 Blackout 13 items
  4. 5.56X45 4 items
  5. 5.56 NATO 44 items
  6. 5.56mm 1 item
  7. 6mm ARC 11 items
  8. 6.5 Grendel 2 items
  9. 9mm 11 items
Category
  1. Receiver Parts 40 items
  2. Parts & Kits 7 items
  3. Barrels 90 items
  4. Buffer Systems 2 items
  5. Trigger Parts 3 items
  6. Muzzle Devices 1 item
  7. Bolt Parts 6 items
  8. Grips 2 items
  9. Charging Handles 4 items
  10. Rifle Handguards 7 items
  11. Stocks & Braces 2 items
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Configuration
  1. Curved 2 items
  2. Flat 2 items
Finish
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  3. Melonite 1 item
  4. Nitride 26 items
  5. Phosphate 1 item
  6. Polished 6 items
  7. Satin 20 items
  8. Anodize 3 items
Gas Block Diameter
  1. .625" 5 items
  2. .750" 70 items
  3. .875" 4 items
Gas System Length
  1. Blowback 10 items
  2. Pistol 11 items
  3. Carbine 14 items
  4. Mid 25 items
  5. Intermediate 4 items
  6. Rifle 22 items
  7. Rifle +1 3 items
  8. Rifle +2 2 items
Inside Diameter
  1. 1.3" 2 items
  2. 1.315" 1 item
Manufacturer
  1. A3 Tactical 1 item
  2. Aero Precision 8 items
  3. Angstadt Arms 1 item
  4. Ballistic Advantage 14 items
  5. Battle Arms Development 2 items
  6. Boss Barrels 1 item
  7. Bravo Company MFG (BCM) 13 items
  8. Centurion Arms 4 items
  9. Cross Machine Tool (CMT) 1 item
  10. Daniel Defense 1 item
  11. DPM Systems Technologies 1 item
  12. Eartune 1 item
  13. Ergo Grips 1 item
  14. Faxon Firearms 19 items
  15. Forward Controls Design 1 item
  16. Geissele 3 items
  17. Icon Defense 1 item
  18. Knight’s Armament Company (KAC) 2 items
  19. Lewis Machine & Tool (LMT) 8 items
  20. Magpul Industries 1 item
  21. Maxim Defense 1 item
  22. NEMO Arms 1 item
  23. Next Level Armament 3 items
  24. Noveske 18 items
  25. Q, LLC 1 item
  26. R&D Precision 1 item
  27. Rainier Arms, LLC 32 items
  28. Rise Armament 1 item
  29. Sharps Bros 1 item
  30. Sons of Liberty Gun Works 7 items
  31. Spinta Precision 4 items
  32. Taran Tactical Innovations 1 item
  33. Triggertech 2 items
  34. V Seven Weapon Systems 2 items
  35. VKTR Industries 5 items
Mount
  1. M-LOK 15 items
  2. Picatinny 2 items
Option
  1. AR-15 8 items
Price
  1. $0.00 - $999.99 159 items
  2. $1,000.00 and above 5 items
Product Type
  1. Accessory 1 item
  2. AR-15 Barrel 90 items
  3. AR-15 Charging Handle 3 items
  4. AR-15 Complete Lower Receiver 11 items
  5. AR-15 Complete Upper Receiver 6 items
  6. AR-15 Partial Upper Receiver 9 items
  7. AR-15 Handguard 7 items
  8. AR-15 Receiver Set 2 items
  9. AR-15 Stripped Lower Receiver 8 items
  10. AR-15 Stripped Upper Receiver 3 items
  11. AR-15 Upper Receiver Group 1 item
  12. Bolt 1 item
  13. Bolt Carrier Group 5 items
  14. Brace 1 item
  15. Buffer 1 item
  16. Buffer Spring 1 item
  17. Charging Handle 2 items
  18. Compensator 1 item
  19. Dust Cover 1 item
  20. Handguard 1 item
  21. Magazine Catch 1 item
  22. Pistol Grip 2 items
  23. Safety Selector 1 item
  24. Stock 1 item
  25. Take Down / Pivot Pins 3 items
  26. Trigger 3 items
Rail Length
  1. 7" 3 items
  2. 7.2" 2 items
  3. 9" 2 items
  4. 9.15" 1 item
  5. 9.5" 1 item
  6. 9.75" 1 item
  7. 10.3" 1 item
  8. 11.1" 1 item
  9. 11.5" 2 items
  10. 11.7" 1 item
  11. 12" 2 items
  12. 12.5" 1 item
  13. 13" 1 item
  14. 13.5" 2 items
  15. 13.7" 1 item
  16. 15" 7 items
Thread Pitch
  1. 1/2x28 (9mm) 8 items
  2. 1/2x28 (.22 cal) 61 items
  3. 1/2x36 1 item
  4. 5/8x24 (.30 cal) 25 items
Threaded
  1. Yes 8 items
  2. No 1 item
Twist Rate
  1. 1:5 2 items
  2. 1:7 57 items
  3. 1:7.5 12 items
  4. 1:8 20 items
  5. 1:10 11 items
Stock Status
  1. Out of stock 164 items Remove This Item
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