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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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  4. Rainier Arms Ultramatch MOD2 .223 Wylde Barrel - 18"
    Rainier Arms Ultramatch MOD2 .223 Wylde Barrel - 18"
    $400.00
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  7. Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver - 10.5"
    Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver - 10.5"
    $550.00
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  8. Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver - 12.5"
    Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver - 12.5"
    $600.00
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  11. Lantac Stingray .223/5.56MM Non Linear Compensator
    Lantac Stingray .223/5.56MM Non Linear Compensator
    $166.99
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Items 49-64 of 259

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Barrel Length
  1. 3.1" 1 item
  2. 4" 3 items
  3. 5" 1 item
  4. 5.5" 2 items
  5. 6" 5 items
  6. 6.75" 1 item
  7. 7.25" 1 item
  8. 7.5" 2 items
  9. 7.75" 1 item
  10. 8" 2 items
  11. 8.3" 3 items
  12. 8.5" 3 items
  13. 10.3" 7 items
  14. 10.5" 20 items
  15. 10.7" 2 items
  16. 11.5" 11 items
  17. 11.85" 1 item
  18. 12" 2 items
  19. 12.3" 1 item
  20. 12.5" 11 items
  21. 13" 1 item
  22. 13.7" 5 items
  23. 13.9" 7 items
  24. 14.5" 19 items
  25. 16" 43 items
  26. 16" Dissipator 1 item
  27. 16.1" 3 items
  28. 16.3" 1 item
  29. 18" 13 items
  30. 20" 4 items
  31. 22" 2 items
Barrel Profile
  1. Full-fluted 9 items
  2. Lightweight 5 items
  3. Half-Fluted 1 item
  4. Non-fluted 8 items
  5. MK12 SPR 2 items
Caliber
  1. .22 ARC 4 items
  2. .22 LR 3 items
  3. .223/5.56 16 items
  4. .223 Rem 1 item
  5. .223 Wylde 27 items
  6. .30 Cal 6 items
  7. .308 1 item
  8. 5.56X45 1 item
  9. 5.56 NATO 87 items
  10. 5.56mm 11 items
  11. 7.62mm 2 items
  12. 9mm 31 items
Category
  1. Receiver Parts 45 items
  2. Parts & Kits 7 items
  3. Barrels 31 items
  4. Rifle Barrels 67 items
  5. Muzzle Devices 128 items
  6. Bolt Parts 1 item
  7. MILSPEC Parts 4 items
Color
Configuration
  1. Gen 3 1 item
  2. .750 DIA 1 item
Finish
  1. Bead Blast 2 items
  2. Black 3 items
  3. Carbon Fiber 1 item
  4. DLC 2 items
  5. Melonite 1 item
  6. Nitride 27 items
  7. Polished 3 items
  8. Satin 4 items
  9. Anodize 2 items
  10. PVD/CVD 1 item
  11. Quench Polish Quench (QPQ) 5 items
Gas Block Diameter
  1. .625" 10 items
  2. .750" 66 items
  3. .875" 2 items
  4. .936" 1 item
Gas Length
  1. Pistol 4 items
  2. Carbine 32 items
  3. Mid 49 items
  4. Intermediate 3 items
  5. Rifle 13 items
  6. Rifle +1 2 items
Height
  1. Absolute Co-Witness 1 item
Inside Diameter
  1. 1.3" 1 item
Is Firearms?
  1. No 259 items
Manufacturer
  1. Advanced Armament Company (AAC) 4 items
  2. Aero Precision 1 item
  3. Aeroknox 1 item
  4. Andro Corp Industries 3 items
  5. Angstadt Arms 5 items
  6. Arms Republic 1 item
  7. Ballistic Advantage 11 items
  8. Battle Arms Development 1 item
  9. Blackout Defense 2 items
  10. Bootleg 1 item
  11. Boss Barrels 2 items
  12. Bravo Company MFG (BCM) 7 items
  13. Centurion Arms 2 items
  14. Christensen Arms 2 items
  15. CMMG 1 item
  16. Cross Machine Tool (CMT) 2 items
  17. Daniel Defense 4 items
  18. Dead Air Armament 3 items
  19. Dead Foot Arms LLC 2 items
  20. Faxon Firearms 8 items
  21. Ferfrans 1 item
  22. Fortis MFG 4 items
  23. Forward Controls Design 14 items
  24. Foxtrot Mike 2 items
  25. Geissele 1 item
  26. Griffin Armament 6 items
  27. HERA ARMS 2 items
  28. Heresy Design 4 items
  29. HUXWRX 4 items
  30. Icon Defense 2 items
  31. JK Armament 2 items
  32. JMAC Customs 13 items
  33. Kinetic Development Group 1 item
  34. Knight’s Armament Company (KAC) 4 items
  35. Lantac 4 items
  36. Mad Pig 1 item
  37. Matador Arms 1 item
  38. Maxim Defense 4 items
  39. NEMO Arms 1 item
  40. Next Level Armament 6 items
  41. Noveske 16 items
  42. Precision Armament 6 items
  43. Primary Weapon Systems 3 items
  44. Q, LLC 3 items
  45. R&D Precision 1 item
  46. Rainier Arms, LLC 45 items
  47. Rainier Industries 2 items
  48. Rex Silentium 1 item
  49. Sharps Bros 3 items
  50. Shooting Innovations 1 item
  51. Sig Sauer 1 item
  52. Silencerco 6 items
  53. Sons of Liberty Gun Works 15 items
  54. Spinta Precision 4 items
  55. Surefire 4 items
  56. Tactical Edge Arms 1 item
  57. Taran Tactical Innovations 1 item
  58. V Seven Weapon Systems 2 items
Mount
  1. KeyMod 1 item
  2. M-LOK 12 items
  3. Picatinny 5 items
Option
  1. AR-10 4 items
  2. AR-15 11 items
  3. 9mm 1 item
  4. Non-Adjustable 2 items
  5. MCS 2 items
  6. Full Size 2 items
Platform
  1. AR-9 2 items
  2. AR-15 40 items
Price
  1. $0.00 - $999.99 245 items
  2. $1,000.00 and above 14 items
Product Type
  1. AR-15 Barrel 15 items
  2. AR-15 Complete Upper Receiver 19 items
  3. AR-15 Partial Upper Receiver 19 items
  4. AR-15 Handguard 1 item
  5. AR-15 Upper Receiver Group 1 item
  6. AR-9 Upper Receiver 1 item
  7. Barrel 64 items
  8. Compensator 27 items
  9. Complete Upper 4 items
  10. Crush Washer 2 items
  11. Flash Hider 37 items
  12. Muzzle Brake 56 items
  13. Muzzle Device Accessory 7 items
  14. Parts Kit 5 items
  15. Shim Set 2 items
Rail Length
  1. 7" 1 item
  2. 9" 1 item
  3. 9.2" 1 item
  4. 9.5" 3 items
  5. 9.55" 4 items
  6. 10" 1 item
  7. 10.5" 1 item
  8. 10.7" 2 items
  9. 11" 2 items
  10. 11.7" 2 items
  11. 11.75" 1 item
  12. 12" 2 items
  13. 12.5" 1 item
  14. 13" 1 item
  15. 13.7" 2 items
  16. 15" 15 items
  17. 15.25" 1 item
Size
  1. 3" 1 item
  2. X-Large 1 item
  3. 6" 1 item
Threaded
  1. Yes 69 items
  2. No 1 item
Twist Rate
  1. 1:7 48 items
  2. 1:7.5 6 items
  3. 1:8 27 items
  4. 1:10 19 items
  5. 1:16 3 items
Stock Status
  1. In stock 185 items
  2. Out of stock 74 items
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