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raineirarms

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. Angstadt Arms 9mm AR-15 Barrel - 6"
    Angstadt Arms 9mm AR-15 Barrel - 6"
    $108.00
    Out of stock
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  3. WMD Guns 5.56 Accent Build Kit - FDE
    WMD Guns 5.56 Accent Build Kit - FDE
    $115.00
    Out of stock
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  5. Rise Armament LE145 Single-Stage Tactical AR-15 Trigger
    Rise Armament LE145 Single-Stage Tactical AR-15 Trigger
    $139.99
    Out of stock
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  6. Midwest Industries AK Drop-In Universal M-LOK Handguard
    Midwest Industries AK Drop-In Universal M-LOK Handguard
    $110.95
    Out of stock
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  10. Geissele Super 7.62 Charging Handle - Black
    Geissele Super 7.62 Charging Handle - Black
    $140.00
    Out of stock
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  11. Tyrant Designs Mod V2 Pistol Grip
    Tyrant Designs Mod V2 Pistol Grip
    Out of stock
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  13. Sons of Liberty Gun Works Stripped Upper Receiver
    Sons of Liberty Gun Works Stripped Upper Receiver
    $142.50
    Out of stock
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  15. Gear Head Works Tailhook Mod 1 MP5K Folding Arm
    Gear Head Works Tailhook Mod 1 MP5K Folding Arm
    $141.70
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  16. Midwest Industries Marlin M-Lok Handguard
    Midwest Industries Marlin M-Lok Handguard
    $178.95
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Items 65-80 of 203

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Barrel Length
  1. 6" 1 item
  2. 7.5" 2 items
  3. 8" 1 item
  4. 8.3" 1 item
  5. 8.5" 3 items
  6. 9" 1 item
  7. 10.5" 4 items
  8. 11" 1 item
  9. 11.5" 2 items
  10. 12.5" 3 items
  11. 13.9" 1 item
  12. 14.5" 1 item
  13. 16" 4 items
  14. 18" 3 items
  15. 20" 2 items
Barrel Profile
  1. Dissipator 2 items
  2. MK12 SPR 1 item
Caliber
  1. .223/5.56 2 items
  2. .223 Wylde 2 items
  3. .30 Cal 1 item
  4. .308 2 items
  5. .308 Win 1 item
  6. .38/.357 Magnum 1 item
  7. .45 ACP 1 item
  8. 300 Blackout 8 items
  9. 5.56 NATO 19 items
  10. 6.5 Grendel 1 item
  11. 7.62mm 3 items
  12. 7.62x51 1 item
  13. 9mm 10 items
Category
  1. Receiver Parts 34 items
  2. Parts & Kits 7 items
  3. Barrels 27 items
  4. Buffer Systems 12 items
  5. Trigger Parts 13 items
  6. Gas Systems 1 item
  7. Muzzle Devices 31 items
  8. Bolt Parts 22 items
  9. Grips 6 items
  10. Charging Handles 7 items
  11. Rifle Handguards 28 items
  12. Stocks & Braces 17 items
Color
Configuration
  1. AR-15 3 items
  2. Curved 3 items
  3. Flat 3 items
  4. M-LOK 1 item
Finish
  1. Black Nitride 2 items
  2. Cerakote 3 items
  3. DLC 3 items
  4. Melonite 1 item
  5. Nickel Boron 2 items
  6. Nitride 12 items
  7. Phosphate 2 items
  8. Anodize 11 items
  9. Quench Polish Quench (QPQ) 1 item
  10. Titanium Nitride (TiN) 1 item
Gas Block Diameter
  1. .625" 2 items
  2. .750" 18 items
Gas System Length
  1. Blowback 4 items
  2. Pistol 7 items
  3. Carbine 7 items
  4. Mid 2 items
  5. Intermediate 2 items
  6. Rifle 4 items
Inside Diameter
  1. 1.3" 1 item
  2. 1.315" 3 items
  3. 1.34" 1 item
  4. 1.4" 1 item
  5. 1.42" 1 item
  6. 1.5" 1 item
Manufacturer
  1. A3 Tactical 1 item
  2. Aero Precision 25 items
  3. Aeroknox 1 item
  4. ALG Defense 1 item
  5. Angstadt Arms 3 items
  6. Arms Republic 1 item
  7. B5 Systems 2 items
  8. Ballistic Advantage 13 items
  9. Battle Arms Development 5 items
  10. Blitzkrieg Components 2 items
  11. Bootleg 1 item
  12. Centurion Arms 2 items
  13. Cross Machine Tool (CMT) 6 items
  14. F5 MFG 1 item
  15. Faxon Firearms 17 items
  16. Ferfrans 1 item
  17. Fortis MFG 4 items
  18. Gear Head Works 2 items
  19. Geissele 6 items
  20. Griffin Armament 2 items
  21. HB Industries 1 item
  22. HERA ARMS 2 items
  23. Hiperfire 6 items
  24. HUXWRX 5 items
  25. JMAC Customs 3 items
  26. JP Enterprises Inc 6 items
  27. Kinetic Development Group 1 item
  28. Knight’s Armament Company (KAC) 2 items
  29. Kalashnikov USA 1 item
  30. KynSHOT 1 item
  31. Lantac 4 items
  32. Magpul Industries 1 item
  33. Maxim Defense 1 item
  34. Midwest Industries 12 items
  35. NEMO Arms 2 items
  36. Next Level Armament 2 items
  37. Noveske 1 item
  38. Precision Armament 3 items
  39. Primary Weapon Systems 2 items
  40. Q, LLC 1 item
  41. Radian Weapons 2 items
  42. Raidworx 1 item
  43. Rainier Arms, LLC 6 items
  44. Reptilia Corp 2 items
  45. Rise Armament 2 items
  46. SB Tactical 3 items
  47. Sharps Bros 1 item
  48. Sig Sauer 1 item
  49. Silencerco 1 item
  50. Sionics Weapon Systems 1 item
  51. Sons of Liberty Gun Works 4 items
  52. Spinta Precision 2 items
  53. Stern Defense 2 items
  54. Surefire 9 items
  55. Triggertech 2 items
  56. Troy Industries 1 item
  57. Tyrant Designs 4 items
  58. V Seven Weapon Systems 1 item
  59. VLTOR 1 item
  60. WMD Guns 3 items
Model
  1. IWI Galil 1 item
  2. Sig MCX 1 item
Mount
  1. M-LOK 13 items
  2. Picatinny 6 items
Option
  1. AK-47/74 2 items
  2. AR-9 4 items
  3. AR-10 4 items
  4. AR-15 43 items
  5. CZ 1 item
  6. Glock 1 item
  7. Heckler & Koch 1 item
  8. Sharps Bros 1 item
Platform
  1. AR-9 1 item
  2. AR-10/LR308 2 items
  3. AR-15 38 items
  4. AK47/74 1 item
  5. IWI 1 item
  6. Sig Sauer 2 items
Price
  1. $100.00 - $109.99 19 items
  2. $110.00 - $119.99 18 items
  3. $120.00 - $129.99 22 items
  4. $130.00 - $139.99 22 items
  5. $140.00 - $149.99 29 items
  6. $150.00 - $159.99 32 items
  7. $160.00 - $169.99 16 items
  8. $170.00 - $179.99 16 items
  9. $180.00 - $189.99 10 items
  10. $190.00 and above 19 items
Product Type
  1. Angled Grip 1 item
  2. AR-10/LR308 Barrel 1 item
  3. AR-10 / LR 308 Charging Handle 2 items
  4. AR-10 Complete Upper Receiver 1 item
  5. AR-10 Handguard 3 items
  6. AR-15 Assembled Upper Receiver 2 items
  7. AR-15 Barrel 26 items
  8. AR-15 Charging Handle 5 items
  9. AR-15 Handguard 12 items
  10. AR-15 Stripped Lower Receiver 17 items
  11. AR-15 Stripped Upper Receiver 12 items
  12. AR-9 Lower Receiver 2 items
  13. Blast Shield 1 item
  14. Bolt 4 items
  15. Bolt Carrier Group 19 items
  16. Brace 4 items
  17. Buffer 4 items
  18. Buffer Kit 3 items
  19. Buffer Spring 3 items
  20. Buffer Tube 2 items
  21. Builders Kit 1 item
  22. Charging Handle 1 item
  23. Compensator 1 item
  24. Flash Hider 11 items
  25. Forearm Accesory 1 item
  26. Handguard 11 items
  27. Lower Parts Kit 4 items
  28. Muzzle Brake 14 items
  29. Muzzle Device Accessory 4 items
  30. Pistol Grip 3 items
  31. Piston System 1 item
  32. Rail Adapter 1 item
  33. Rail Section 1 item
  34. Safety Selector 1 item
  35. Stock 6 items
  36. Stock Accessory 4 items
  37. Stock Adapter 3 items
  38. Trigger 13 items
Rail Length
  1. 3" 1 item
  2. 4" 1 item
  3. 5.5" 1 item
  4. 6.0" 2 items
  5. 6.7" 4 items
  6. 7" 2 items
  7. 7.25" 1 item
  8. 8.25" 1 item
  9. 9" 2 items
  10. 9.5" 3 items
  11. 9.6" 2 items
  12. 10.25" 1 item
  13. 10.5" 4 items
  14. 12" 3 items
  15. 12.4" 2 items
  16. 12.5" 1 item
  17. 12.625" 1 item
  18. 13" 3 items
  19. 13.7" 3 items
  20. 13.8" 2 items
  21. 15" 11 items
  22. 15.3" 2 items
Size
  1. BACK STRAP:Large 1 item
  2. BACK STRAP:Medium 2 items
  3. 9 Slot 1 item
Thread Pitch
  1. 1.125x28 1 item
  2. 1/2x28 (9mm) 4 items
  3. 1/2x28 (.22 cal) 25 items
  4. 1/2x36 1 item
  5. 5/8x24 (.30 cal) 14 items
Threaded
  1. Yes 5 items
Twist Rate
  1. 1:5 1 item
  2. 1:7 11 items
  3. 1:8 9 items
  4. 1:10 6 items
Stock Status
  1. Out of stock 203 items Remove This Item
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