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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 Premium Series 416R SS 223 Wylde 16" Fluted
    Ballistic Advantage Premium Series 416R SS 223 Wylde 16" Fluted
    $237.50
    Out of stock
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  2. Noveske Recon Stainless Lo-Pro Gas Block Barrel 5.56 - 16"
    Noveske Recon Stainless Lo-Pro Gas Block Barrel 5.56 - 16"
    $418.00
    Out of stock
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  3. Noveske N4 Light 5.56MM Barrel - 14.5 Switchblock
    Noveske N4 Light 5.56MM Barrel - 14.5 Switchblock
    $641.25
    Out of stock
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  4. Faxon Firearms AR-15 Match Series .223 Wylde, 416R, QPQ, 5R Flame Barrel - 16
    Faxon Firearms AR-15 Match Series .223 Wylde, 416R, QPQ, 5R Flame Barrel - 16
    $289.80
    Out of stock
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  5. Noveske Crusader 5.56mm Barrel - 12.5"
    Noveske Crusader 5.56mm Barrel - 12.5"
    $403.75
    Out of stock
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  6. V Seven Weapon Systems 308 WIN Stainless Match Barrel - 16.1"
    V Seven Weapon Systems 308 WIN Stainless Match Barrel - 16.1"
    $583.94
    Out of stock
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  7. Blackout Defense Quantum Mark 2 .223 Wylde Complete Upper Receiver
    Blackout Defense Quantum Mark 2 .223 Wylde Complete Upper Receiver
    Out of stock
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  8. Noveske N4 Afghan Gen 4 5.56 NATO Complete Upper - 14.5" Black
    Noveske N4 Afghan Gen 4 5.56 NATO Complete Upper - 14.5" Black
    $1,448.75
    Out of stock
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  9. Noveske N4 Recon Gen 4 5.56 NATO Complete Upper - 16" Black
    Noveske N4 Recon Gen 4 5.56 NATO Complete Upper - 16" Black
    $1,496.25
    Out of stock
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  10. Noveske CHF Chrome Lined Lo-Pro Gas Block 5.56 NATO Barrel - 14.5"
    Noveske CHF Chrome Lined Lo-Pro Gas Block 5.56 NATO Barrel - 14.5"
    $503.50
    Out of stock
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  11. Noveske 14.5" Lightweight 5.56mm Stainless Barrel
    Noveske 14.5" Lightweight 5.56mm Stainless Barrel
    $399.00
    Out of stock
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  12. Centurion Arms Lightweight Hammer Forged 5.56 Barrel - 16"
    Centurion Arms Lightweight Hammer Forged 5.56 Barrel - 16"
    $285.00
    Out of stock
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  13. Rainier Arms Ultramatch MOD2 .223 Wylde AR-15 Barrel - 12" Satin
    Rainier Arms Ultramatch MOD2 .223 Wylde AR-15 Barrel - 12" Satin
    $400.00
    Out of stock
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  14. Daniel Defense DD4 RIII Complete Upper Receiver - 16" Black
    Daniel Defense DD4 RIII Complete Upper Receiver - 16" Black
    $1,499.00
    Out of stock
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  15. Faxon Firearms 6.5 Grendel 416-R Stainless Gunner Barrel MATCH SERIES - 18"
    Faxon Firearms 6.5 Grendel 416-R Stainless Gunner Barrel MATCH SERIES - 18"
    $234.60
    Out of stock
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  16. Faxon Firearms AR-15 Gunner 6mm ARC 5R Nitride Barrel - 16"
    Faxon Firearms AR-15 Gunner 6mm ARC 5R Nitride Barrel - 16"
    $225.40
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Items 97-112 of 112

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Barrel Length
  1. 7.5" 1 item
  2. 7.75" 1 item
  3. 8.5" 1 item
  4. 10.3" 1 item
  5. 10.5" 9 items
  6. 11.5" 6 items
  7. 12" 2 items
  8. 12.5" 10 items
  9. 13.7" 4 items
  10. 13.9" 6 items
  11. 14.5" 25 items
  12. 16" 70 items
  13. 16.1" 1 item
  14. 18" 7 items
  15. 20" 2 items
Barrel Profile
  1. Full-fluted 1 item
  2. Lightweight 4 items
  3. Half-Fluted 1 item
  4. Non-fluted 4 items
  5. MK12 SPR 2 items
Caliber
  1. .223/5.56 2 items
  2. .223 Rem 1 item
  3. .223 Wylde 16 items
  4. .308 Win 1 item
  5. 5.56X45 2 items
  6. 5.56 NATO 46 items
  7. 5.56mm 1 item
  8. 6mm ARC 4 items
  9. 6.5 Grendel 6 items
  10. 6.8 SPC 1 item
  11. 7.62x51 5 items
Category
  1. Receiver Parts 26 items
  2. Parts & Kits 1 item
  3. Barrels 19 items
  4. Rifle Barrels 48 items
  5. Buffer Systems 4 items
  6. Gas Systems 9 items
  7. Muzzle Devices 4 items
  8. Bolt Parts 1 item
  9. Grips 1 item
  10. Rifle Handguards 1 item
  11. Stocks & Braces 2 items
Color
Configuration
  1. Clamp on Piston Block 1 item
  2. M-LOK 2 items
  3. Solid Piston Block 1 item
  4. .750 DIA 12 items
Finish
  1. Bead Blast 2 items
  2. Black 1 item
  3. Carbon Fiber 1 item
  4. Chrome 1 item
  5. Nitride 14 items
  6. Phosphate 1 item
  7. Satin 6 items
  8. Anodize 1 item
  9. Quench Polish Quench (QPQ) 1 item
Gas Block Diameter
  1. .625" 9 items
  2. .750" 46 items
  3. .936" 1 item
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.3" 1 item
Is Firearms?
  1. No 112 items
Manufacturer
  1. Aero Precision 1 item
  2. Ballistic Advantage 7 items
  3. Blackout Defense 2 items
  4. Boss Barrels 3 items
  5. Bravo Company MFG (BCM) 5 items
  6. Centurion Arms 1 item
  7. Christensen Arms 2 items
  8. Daniel Defense 4 items
  9. Faxon Firearms 15 items
  10. Geissele 1 item
  11. Lantac 1 item
  12. Lewis Machine & Tool (LMT) 1 item
  13. Magpul Industries 2 items
  14. Noveske 12 items
  15. Precision Armament 1 item
  16. Primary Weapon Systems 1 item
  17. Rainier Arms, LLC 26 items
  18. Riflespeed 1 item
  19. Sharps Bros 1 item
  20. Sionics Weapon Systems 1 item
  21. Sons of Liberty Gun Works 7 items
  22. Stag Arms 1 item
  23. Superlative Arms 4 items
  24. Tactical Edge Arms 1 item
  25. Troy Industries 1 item
  26. V Seven Weapon Systems 1 item
  27. VLTOR 7 items
Mount
  1. KeyMod 14 items
  2. M-LOK 10 items
  3. Picatinny 1 item
Option
  1. AR-10 1 item
  2. AR-15 15 items
  3. Standard 1 item
  4. Non-Adjustable 3 items
Platform
  1. AR-10 2 items
  2. AR-15 33 items
Price
  1. $0.00 - $999.99 104 items
  2. $1,000.00 and above 8 items
Product Type
  1. AR-10 Barrel 2 items
  2. AR-15 Barrel 15 items
  3. AR-15 Complete Upper Receiver 14 items
  4. AR-15 Partial Upper Receiver 12 items
  5. Barrel 48 items
  6. Buffer Kit 1 item
  7. Buffer Tube 3 items
  8. Flash Hider 3 items
  9. Gas Tube 4 items
  10. Handguard 1 item
  11. Muzzle Brake 1 item
  12. Patch 1 item
  13. Piston System 4 items
  14. Stock 2 items
Rail Length
  1. 9.5" 1 item
  2. 9.55" 1 item
  3. 10" 14 items
  4. 10.7" 1 item
  5. 11.7" 1 item
  6. 12.5" 3 items
  7. 13" 2 items
  8. 13.7" 2 items
  9. 14" 1 item
  10. 15" 11 items
  11. 16" 1 item
Size
  1. 35mm rings 1 item
  2. Small 1 item
  3. X-Large 2 items
  4. 9 Slot 11 items
Thread Pitch
  1. 1/2x28 50 items
  2. 5/8x24 13 items
Threaded
  1. Yes 26 items
Twist Rate
  1. 1:7 37 items
  2. 1:7.5 2 items
  3. 1:8 23 items
  4. 1:10 2 items
Stock Status
  1. In stock 77 items
  2. Out of stock 35 items
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