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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. Young Mfg National Match LITE Bolt Carrier Group
    Young Mfg National Match LITE Bolt Carrier Group
    $265.00
    Out of stock
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  2. Young Mfg National Match Bolt Carrier Group w/Side Charger
    Young Mfg National Match Bolt Carrier Group w/Side Charger
    $210.00
    Out of stock
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  3. NorthTech Defense AR15 Billet Upper Receiver
    NorthTech Defense AR15 Billet Upper Receiver
    $237.45
    Out of stock
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  4. Aero Precision AR15 M4E1 RECEIVER SET - BLACK
    Aero Precision AR15 M4E1 RECEIVER SET - BLACK
    $269.98
    Out of stock
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  5. Aero Precision M5 (.308/7.62) Stripped Lower Receiver - FDE
    Aero Precision M5 (.308/7.62) Stripped Lower Receiver - FDE
    $229.99
    Out of stock
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  6. Aero Precision .308/7.62 Bolt Carrier Group (BCG) - Black Nitride
    Aero Precision .308/7.62 Bolt Carrier Group (BCG) - Black Nitride
    $234.99
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  7. Aero Precision AR15 Gen 2 Carbine Complete Lower w/ A2 Grip, No Stock - Black
    Aero Precision AR15 Gen 2 Carbine Complete Lower w/ A2 Grip, No Stock - Black
    $274.99
    Out of stock
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  8. Aero Precision AR15 Atlas S-One Handguard 15" - FDE
    Aero Precision AR15 Atlas S-One Handguard 15" - FDE
    $219.99
    Out of stock
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  9. Aero Precision AR-15 Atlas R-ONE M-LOK Handguard - 15" FDE
    Aero Precision AR-15 Atlas R-ONE M-LOK Handguard - 15" FDE
    $219.99
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  10. A3 Tactical Offset Modular Side Folding Arm Brace for Tailhook - CZ Scorpion
    A3 Tactical Offset Modular Side Folding Arm Brace for Tailhook - CZ Scorpion
    $237.45
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  11. A3 Tactical Offset Modular Side Folding Arm Brace for Tailhook - Picatinny 5.9375"
    A3 Tactical Offset Modular Side Folding Arm Brace for Tailhook - Picatinny 5.9375"
    $218.45
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  12. A3 Tactical Skelestock Modular Folding Stock w/ Sig Mount - 9.5"
    A3 Tactical Skelestock Modular Folding Stock w/ Sig Mount - 9.5"
    $279.95
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  13. A3 Tactical Picatinny Modular Offset Folding Stock - 7.75" Magpul Rubber Pad
    A3 Tactical Picatinny Modular Offset Folding Stock - 7.75" Magpul Rubber Pad
    $256.45
    Out of stock
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  14. Aero Precision M5 (.308/7.62) Stripped Lower Receiver - Black
    Aero Precision M5 (.308/7.62) Stripped Lower Receiver - Black
    $209.99
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  15. Aero Precision M4E1 Carbine Complete Lower Receiver w/ A2 Grip, No Stock - Black
    Aero Precision M4E1 Carbine Complete Lower Receiver w/ A2 Grip, No Stock - Black
    $294.99
    Out of stock
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  16. Agency Arms Benelli M2 Modular M-LOK Rail
    Agency Arms Benelli M2 Modular M-LOK Rail
    $250.00
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Barrel Length
  1. 11.5" 1 item
  2. 12.5" 1 item
  3. 13.7" 1 item
  4. 14.5" 2 items
  5. 16" 13 items
  6. 18" 4 items
  7. 20" 2 items
  8. 22" 1 item
Barrel Profile
  1. Non-fluted 1 item
Caliber
  1. .223/5.56 2 items
  2. .223 Wylde 1 item
  3. .30-30 1 item
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  6. .458 Socom 1 item
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  10. 7.62mm 1 item
  11. 9mm 2 items
Category
  1. Receiver Parts 23 items
  2. Barrels 5 items
  3. Rifle Barrels 17 items
  4. Trigger Parts 20 items
  5. Muzzle Devices 1 item
  6. Bolt Parts 11 items
  7. Charging Handles 1 item
  8. Rifle Handguards 23 items
  9. Stocks & Braces 21 items
Co Witness
  1. Lower 1/3 1 item
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  6. Nickel Boron 1 item
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  9. Satin 2 items
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  11. Quench Polish Quench (QPQ) 1 item
Gas Block Diameter
  1. .750" 8 items
  2. .875" 2 items
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Inside Diameter
  1. 1.34" 1 item
  2. 1.55" 1 item
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  1. A3 Tactical 4 items
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  3. Agency Arms 1 item
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  5. Ascalon Arms 1 item
  6. B5 Systems 1 item
  7. Ballistic Advantage 7 items
  8. Battle Arms Development 4 items
  9. Blackout Defense 5 items
  10. Bravo Company MFG (BCM) 3 items
  11. Centurion Arms 2 items
  12. Daniel Defense 1 item
  13. F5 MFG 11 items
  14. Faxon Firearms 11 items
  15. Fortis MFG 1 item
  16. Forward Controls Design 1 item
  17. Geissele 5 items
  18. HB Industries 1 item
  19. Hiperfire 2 items
  20. JMAC Customs 1 item
  21. Knight’s Armament Company (KAC) 4 items
  22. Lantac 2 items
  23. Lewis Machine & Tool (LMT) 1 item
  24. Midwest Industries 4 items
  25. Noveske 3 items
  26. Primary Weapon Systems 1 item
  27. Rainier Arms, LLC 11 items
  28. SB Tactical 1 item
  29. Sharps Bros 1 item
  30. Silencerco 1 item
  31. SLR Rifleworks 1 item
  32. Sons of Liberty Gun Works 1 item
  33. Timney Triggers 4 items
  34. Triggertech 3 items
  35. Troy Industries 3 items
  36. V Seven Weapon Systems 1 item
  37. VLTOR 2 items
Model
  1. CZ Bren 1 item
  2. CZ Scorpion 2 items
  3. H&K G36 1 item
  4. Remington 700 2 items
  5. Sig MCX 1 item
Mount
  1. KeyMod 1 item
  2. M-LOK 9 items
  3. Picatinny 6 items
Option
  1. AR-10 7 items
  2. AR-15 24 items
  3. WA 1 item
  4. KS 1 item
  5. CZ 2 items
  6. Glock 1 item
  7. AKM 1 item
Platform
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  2. AR-15 10 items
  3. AK47/74 3 items
  4. CZ-USA 2 items
  5. Remington 2 items
  6. Sig Sauer 1 item
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  1. $200.00 - $209.99 15 items
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  5. $240.00 - $249.99 12 items
  6. $250.00 - $259.99 10 items
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  8. $270.00 - $279.99 9 items
  9. $280.00 - $289.99 8 items
  10. $290.00 and above 15 items
Product Type
  1. AR-10 Handguard 2 items
  2. AR-10 Stripped Lower Receiver 2 items
  3. AR-10 Stripped Upper Receiver 2 items
  4. AR-15 Barrel 5 items
  5. AR-15 Complete Lower Receiver 5 items
  6. AR-15 Handguard 10 items
  7. AR-15 Receiver Set 1 item
  8. AR-15 Stripped Lower Receiver 2 items
  9. AR-15 Stripped Upper Receiver 6 items
  10. AR-9 Lower Receiver 2 items
  11. AR-9 Upper Receiver 1 item
  12. Barrel 17 items
  13. Bolt Carrier Group 9 items
  14. Brace 3 items
  15. Charging Handle 1 item
  16. Handguard 11 items
  17. Handgun 1 item
  18. Muzzle Brake 1 item
  19. Rail Adapter 1 item
  20. Scope Mount 1 item
  21. Stock 17 items
  22. Stock Accessory 1 item
  23. Trigger 20 items
Rail Length
  1. 7" 2 items
  2. 9" 3 items
  3. 9.6" 1 item
  4. 10" 2 items
  5. 10.75" 1 item
  6. 11" 1 item
  7. 12" 3 items
  8. 12.5" 1 item
  9. 13" 1 item
  10. 13.5" 3 items
  11. 13.7" 1 item
  12. 14" 1 item
  13. 15" 8 items
Size
  1. 9 Slot 2 items
Thread Pitch
  1. 1/2x28 6 items
  2. 5/8x24 6 items
Threaded
  1. Yes 1 item
Twist Rate
  1. 1:7 5 items
  2. 1:7.5 2 items
  3. 1:8 1 item
  4. 1:10 1 item
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  2. Out of stock 122 items Remove This Item
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