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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. Lantac NITRIDED GAS TUBE
    Lantac NITRIDED GAS TUBE
    Out of stock
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  2. Faxon Firearms AR-15 5.56 SOCOM Profile Barrel - 10.5
    Faxon Firearms AR-15 5.56 SOCOM Profile Barrel - 10.5
    $142.60
    Out of stock
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  3. Noveske CHF Chrome Lined Switchblock 5.56 NATO Barrel - 10.5"
    Noveske CHF Chrome Lined Switchblock 5.56 NATO Barrel - 10.5"
    $565.25
    Out of stock
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  4. Noveske N4 Light 5.56MM Barrel - 10.5 LP
    Noveske N4 Light 5.56MM Barrel - 10.5 LP
    $450.00
    Out of stock
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  5. Ballistic Advantage Modern Series 5.56 NATO Government Profile Barrel - 11.5"
    Ballistic Advantage Modern Series 5.56 NATO Government Profile Barrel - 11.5"
    $147.25
    Out of stock
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  6. Sionics Weapon Systems (SWS) AR-15 Premium Complete 5.56 Upper Receiver - 11.5" (Phosphate BCG)
    Sionics Weapon Systems (SWS) AR-15 Premium Complete 5.56 Upper Receiver - 11.5" (Phosphate BCG)
    $789.95
    Out of stock
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  7. Noveske Leonidas CHF Chrome Lined 5.56 NATO FSB Barrel - 12.5"
    Noveske Leonidas CHF Chrome Lined 5.56 NATO FSB Barrel - 12.5"
    $530.00
    Out of stock
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  8. Angstadt Arms AR-15 5.56 Complete Upper Assembly - 16"
    Angstadt Arms AR-15 5.56 Complete Upper Assembly - 16"
    $404.00
    Out of stock
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  9. Troy Industries Battle Rail Drop-In Delta Handguard - Carbine Gas Length
    Troy Industries Battle Rail Drop-In Delta Handguard - Carbine Gas Length
    $276.00
    Out of stock
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  10. Noveske Stainless Lo-Pro Gas Block 7.62x51 Barrel - 12.5" Leonidas
    Noveske Stainless Lo-Pro Gas Block 7.62x51 Barrel - 12.5" Leonidas
    $475.00
    Out of stock
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  11. Centurion Arms Lightweight Hammer Forged 5.56 Barrel - 11.5"
    Centurion Arms Lightweight Hammer Forged 5.56 Barrel - 11.5"
    $285.00
    Out of stock
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  12. Daniel Defense MK18 RIII Complete Upper Receiver - 10.3" FDE
    Daniel Defense MK18 RIII Complete Upper Receiver - 10.3" FDE
    $1,412.00
    Out of stock
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Items 49-60 of 60

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Barrel Length
  1. 7.5" 2 items
  2. 7.75" 1 item
  3. 8" 1 item
  4. 8.5" 1 item
  5. 10.3" 6 items
  6. 10.5" 21 items
  7. 11.5" 9 items
  8. 11.85" 1 item
  9. 12" 2 items
  10. 12.3" 1 item
  11. 12.5" 12 items
  12. 13.7" 2 items
  13. 13.9" 2 items
  14. 14.5" 7 items
  15. 16" 17 items
  16. 16" Dissipator 1 item
  17. 18" 4 items
Barrel Profile
  1. Lightweight 2 items
  2. Half-Fluted 1 item
  3. Non-fluted 7 items
  4. MK12 SPR 1 item
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  1. .223/5.56 2 items
  2. .223 Wylde 6 items
  3. .308 1 item
  4. .458 Socom 1 item
  5. 5.56X45 1 item
  6. 5.56 NATO 29 items
  7. 5.56mm 2 items
  8. 6.5 Grendel 1 item
  9. 7.62x39 1 item
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  11. 8.6 Blackout 1 item
Category
  1. Receiver Parts 14 items
  2. Barrels 7 items
  3. Rifle Barrels 34 items
  4. Gas Systems 9 items
  5. Rifle Handguards 3 items
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  1. Clamp on Piston Block 1 item
  2. Solid Piston Block 1 item
  3. .625 DIA 1 item
  4. .750 DIA 1 item
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  1. Nitride 8 items
  2. Satin 1 item
  3. Quench Polish Quench (QPQ) 3 items
Gas Block Diameter
  1. .625" 4 items
  2. .750" 32 items
  3. .875" 1 item
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  1. Absolute Co-Witness 1 item
Is Firearms?
  1. No 60 items
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  1. Angstadt Arms 1 item
  2. Ballistic Advantage 5 items
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  5. Centurion Arms 2 items
  6. Daniel Defense 4 items
  7. Faxon Firearms 6 items
  8. Geissele 1 item
  9. Lantac 1 item
  10. Lewis Machine & Tool (LMT) 2 items
  11. Maxim Defense 1 item
  12. NEMO Arms 1 item
  13. Noveske 5 items
  14. Primary Weapon Systems 1 item
  15. Rainier Arms, LLC 13 items
  16. Riflespeed 1 item
  17. Sionics Weapon Systems 1 item
  18. Sons of Liberty Gun Works 6 items
  19. Spinta Precision 1 item
  20. Superlative Arms 4 items
  21. Troy Industries 1 item
Mount
  1. M-LOK 5 items
  2. Picatinny 1 item
Option
  1. AR-15 1 item
  2. Non-Adjustable 2 items
Platform
  1. AR-10 1 item
  2. AR-15 15 items
Price
  1. $0.00 - $999.99 55 items
  2. $1,000.00 and above 5 items
Product Type
  1. AR-10 Barrel 1 item
  2. AR-15 Barrel 3 items
  3. AR-15 Complete Upper Receiver 5 items
  4. AR-15 Partial Upper Receiver 7 items
  5. AR-15 Handguard 2 items
  6. Barrel 32 items
  7. Complete Upper 1 item
  8. Gas Tube 5 items
  9. Handguard 2 items
  10. Piston System 4 items
Rail Length
  1. 9.2" 1 item
  2. 9.5" 5 items
  3. 9.55" 1 item
  4. 11" 2 items
  5. 11.5" 1 item
  6. 11.7" 1 item
  7. 12.5" 1 item
  8. 13.25" 1 item
  9. 15" 3 items
Thread Pitch
  1. 1/2x28 32 items
  2. 5/8x24 4 items
  3. M18x1.5 1 item
Threaded
  1. Yes 21 items
  2. No 1 item
Twist Rate
  1. 1:3 1 item
  2. 1:7 26 items
  3. 1:7.5 1 item
  4. 1:8 8 items
  5. 1:10 4 items
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  1. In stock 47 items
  2. Out of stock 13 items
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