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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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Items 33-48 of 130

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  1. SLR Rifleworks AR-15 SLR-B15 Billet Upper Receivers
    SLR Rifleworks AR-15 SLR-B15 Billet Upper Receivers
    $249.00
    Out of stock
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  4. Law Tactical Gen 3-M AR Folding Stock Adapter
    Law Tactical Gen 3-M AR Folding Stock Adapter
    $259.99
    Out of stock
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  5. Rainier Arms UltraMatch Billet Upper - MOD 3
    Rainier Arms UltraMatch Billet Upper - MOD 3
    $204.95
    Out of stock
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  6. Hiperfire HIPERTOUCH Reflex, AR15/10 Trigger Assembly
    Hiperfire HIPERTOUCH Reflex, AR15/10 Trigger Assembly
    $213.75
    Out of stock
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  7. Lantac UAR Upper Advanced Receiver inc CP-R360 Cam Pin
    Lantac UAR Upper Advanced Receiver inc CP-R360 Cam Pin
    $229.99
    Out of stock
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  9. LANTAC E-BCG
    LANTAC E-BCG
    $261.99
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  10. Battle Arms Development Lightweight Billet Upper Receiver
    Battle Arms Development Lightweight Billet Upper Receiver
    $239.00
    Out of stock
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  11. Hiperfire HIPERTOUCH ECLipse, AR15/10 Trigger Assembly
    Hiperfire HIPERTOUCH ECLipse, AR15/10 Trigger Assembly
    $261.25
    Out of stock
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  12. Rise Armament RA-535 Advanced Performance AR-15 Trigger
    Rise Armament RA-535 Advanced Performance AR-15 Trigger
    $249.99
    Out of stock
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  14. V Seven Weapon Systems 7075 Billet Enlightened AR15 Upper
    V Seven Weapon Systems 7075 Billet Enlightened AR15 Upper
    $287.12
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  15. Law Tactical Gen 3-M AR Folding Stock Adapter - FDE
    Law Tactical Gen 3-M AR Folding Stock Adapter - FDE
    $269.99
    Out of stock
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Items 33-48 of 130

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Barrel Length
  1. 10.3" 1 item
  2. 10.5" 1 item
  3. 11.5" 1 item
  4. 12" 2 items
  5. 13.7" 1 item
  6. 14.5" 1 item
  7. 16" 13 items
  8. 16.1" 1 item
  9. 18" 3 items
  10. 20" 3 items
Barrel Profile
  1. DMR 2 items
  2. MK12 SPR 3 items
Caliber
  1. .223 Wylde 5 items
  2. .30-30 1 item
  3. .308 1 item
  4. .308 Win 3 items
  5. .458 Socom 1 item
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  7. 5.56 NATO 10 items
  8. 6mm ARC 6 items
  9. 7.62mm 1 item
  10. 8.6 Blackout 1 item
  11. 9mm 2 items
Category
  1. Receiver Parts 29 items
  2. Barrels 26 items
  3. Trigger Parts 14 items
  4. Muzzle Devices 3 items
  5. Bolt Parts 15 items
  6. Charging Handles 1 item
  7. Rifle Handguards 24 items
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  2. 1.55" 1 item
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  11. Elftmann Tactical 1 item
  12. F5 MFG 9 items
  13. Faxon Firearms 10 items
  14. Fortis MFG 1 item
  15. Forward Controls Design 1 item
  16. Geissele 3 items
  17. Hiperfire 3 items
  18. JMAC Customs 1 item
  19. Knight’s Armament Company (KAC) 4 items
  20. Lantac 3 items
  21. Law Tactical 2 items
  22. Lee Sporting 4 items
  23. Lewis Machine & Tool (LMT) 2 items
  24. Midwest Industries 4 items
  25. Next Level Armament 1 item
  26. Noveske 5 items
  27. Primary Weapon Systems 1 item
  28. Q, LLC 1 item
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  30. Rainier Arms, LLC 7 items
  31. Rise Armament 2 items
  32. Sharps Bros 3 items
  33. Silencerco 2 items
  34. SLR Rifleworks 1 item
  35. Sons of Liberty Gun Works 1 item
  36. Surefire 1 item
  37. Timney Triggers 2 items
  38. Triggertech 1 item
  39. Troy Industries 3 items
  40. V Seven Weapon Systems 1 item
  41. VKTR Industries 3 items
  42. VLTOR 1 item
  43. WMD Guns 1 item
Model
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  2. Remington 700 2 items
  3. Sig MCX 1 item
Mount
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  2. M-LOK 14 items
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Option
  1. AR-10 9 items
  2. AR-15 24 items
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  2. AR-15 30 items
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  5. $240.00 - $249.99 11 items
  6. $250.00 - $259.99 11 items
  7. $260.00 - $269.99 13 items
  8. $270.00 - $279.99 11 items
  9. $280.00 - $289.99 9 items
  10. $290.00 and above 23 items
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  1. AR-10/LR308 Barrel 4 items
  2. AR-10 Handguard 2 items
  3. AR-10 Stripped Lower Receiver 3 items
  4. AR-10 Stripped Upper Receiver 2 items
  5. AR-15 Barrel 22 items
  6. AR-15 Complete Lower Receiver 6 items
  7. AR-15 Handguard 14 items
  8. AR-15 Receiver Set 1 item
  9. AR-15 Stripped Lower Receiver 4 items
  10. AR-15 Stripped Upper Receiver 5 items
  11. AR-9 Lower Receiver 2 items
  12. AR-9 Upper Receiver 1 item
  13. Blast Shield 1 item
  14. Bolt Carrier Group 13 items
  15. Brace 1 item
  16. Charging Handle 1 item
  17. Handguard 7 items
  18. Handgun 1 item
  19. Lower Receiver 4 items
  20. Muzzle Brake 1 item
  21. Muzzle Device Accessory 2 items
  22. Rail Adapter 1 item
  23. Scope Mount 1 item
  24. Stock 13 items
  25. Stock Accessory 2 items
  26. Trigger 14 items
Rail Length
  1. 7" 2 items
  2. 7.2" 1 item
  3. 9" 1 item
  4. 9.6" 1 item
  5. 10" 3 items
  6. 10.75" 1 item
  7. 11.1" 1 item
  8. 12" 1 item
  9. 12.5" 1 item
  10. 13" 1 item
  11. 13.5" 2 items
  12. 13.7" 1 item
  13. 14" 1 item
  14. 15" 9 items
Size
  1. 9 Slot 1 item
Thread Pitch
  1. 1.375-24 1 item
  2. 1/2x28 (9mm) 1 item
  3. 1/2x28 (.22 cal) 14 items
  4. 5/8x24 (.30 cal) 8 items
  5. 11/16x24 1 item
  6. M18x1.5 1 item
Twist Rate
  1. 1:3 1 item
  2. 1:7 13 items
  3. 1:8 5 items
  4. 1:10 5 items
  5. 1:14 1 item
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