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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. Sig Sauer TREAD Vertical M-LOK Grip Kit
    Sig Sauer TREAD Vertical M-LOK Grip Kit
    Special Price $37.99 Regular Price $49.99
    Out of stock
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  2. Aero Precision Low Profile Gas Block - .750 Nitride
    Aero Precision Low Profile Gas Block - .750 Nitride
    $35.99
    Out of stock
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  4. KNS Precision Galil Ace Picatinny Stock Adapter
    KNS Precision Galil Ace Picatinny Stock Adapter
    $35.00
    Out of stock
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  5. Griffin Armament GAS Ambi Safety Selector Kit
    Griffin Armament GAS Ambi Safety Selector Kit
    $38.00
    Out of stock
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  7. Hera Arms CQR Front Grip Gen 2
    Hera Arms CQR Front Grip Gen 2
    Out of stock
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  8. Accu-Tac Picatinny Rail Mount for Bipod
    Accu-Tac Picatinny Rail Mount for Bipod
    $32.30
    Out of stock
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  11. Midwest Industries Marlin 336 Handguard Adaptor
    Midwest Industries Marlin 336 Handguard Adaptor
    $36.95
    Out of stock
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  12. Faxon Firearms AR-10 Height 3 Screw Gas Block - .875
    Faxon Firearms AR-10 Height 3 Screw Gas Block - .875
    $39.79
    Out of stock
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  13. Aeroknox Micro-Stop - M-Lok
    Aeroknox Micro-Stop - M-Lok
    $35.00
    Out of stock
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  14. Aeroknox Field Pins
    Aeroknox Field Pins
    $37.00
    Out of stock
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  16. V Seven Weapon Systems Ultra Light Mag Catch / Release
    V Seven Weapon Systems Ultra Light Mag Catch / Release
    $36.86
    Out of stock
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Items 97-112 of 138

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  1. Price $30.00 - $39.99 Remove This Item
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Barrel Length
  1. 7" 1 item
  2. 16" 1 item
  3. 18" 3 items
Caliber
  1. 5.56 NATO 1 item
  2. 9mm 1 item
Category
  1. Receiver Parts 1 item
  2. Parts & Kits 44 items
  3. Buffer Systems 4 items
  4. Trigger Parts 8 items
  5. Gas Systems 12 items
  6. Muzzle Devices 4 items
  7. Bolt Parts 5 items
  8. Grips 33 items
  9. Charging Handles 3 items
  10. Rifle Handguards 12 items
  11. Stocks & Braces 9 items
  12. MILSPEC Parts 3 items
Color
Configuration
  1. AR-15 2 items
  2. Gen 1-3 1 item
  3. GEN 2 1 item
  4. Left Hand 1 item
  5. M-LOK 1 item
  6. Right Hand 1 item
  7. .625 DIA 2 items
  8. .750 DIA 1 item
  9. .800 DIA 1 item
  10. .875 DIA 1 item
  11. .936 DIA 1 item
Finish
  1. Black 3 items
  2. Black Nitride 1 item
  3. Melonite 1 item
  4. Nitride 2 items
  5. Red 2 items
  6. Anodize 1 item
Gas Block Diameter
  1. .625" 1 item
  2. .750" 7 items
  3. .875" 2 items
  4. .936" 1 item
Gas System Length
  1. Pistol 1 item
  2. Mid 1 item
  3. Intermediate 3 items
Manufacturer
  1. A3 Tactical 2 items
  2. Accu-Tac 1 item
  3. Aero Precision 1 item
  4. Aeroknox 2 items
  5. Arisaka 4 items
  6. Armaspec 2 items
  7. Arms Republic 3 items
  8. Ascalon Arms 2 items
  9. B5 Systems 1 item
  10. Battle Arms Development 6 items
  11. Blitzkrieg Components 2 items
  12. Bravo Company MFG (BCM) 2 items
  13. Drew Meyers Defense 2 items
  14. Driven Arms Co. 9 items
  15. Elftmann Tactical 1 item
  16. Emissary Development 3 items
  17. Ergo Grips 2 items
  18. Faxon Firearms 3 items
  19. Fortis MFG 6 items
  20. Forward Controls Design 13 items
  21. Gear Head Works 1 item
  22. Griffin Armament 1 item
  23. HB Industries 3 items
  24. HERA ARMS 3 items
  25. JK Armament 1 item
  26. JP Enterprises Inc 3 items
  27. KAK Industries 1 item
  28. Kinetic Development Group 2 items
  29. Knight’s Armament Company (KAC) 1 item
  30. KNS Precision 3 items
  31. Kratos Design Group 1 item
  32. Lantac 2 items
  33. LUTH-AR 1 item
  34. Magpul Industries 8 items
  35. Midwest Industries 1 item
  36. Next Level Armament 2 items
  37. Primary Weapon Systems 1 item
  38. Q, LLC 3 items
  39. Rainier Arms, LLC 2 items
  40. Rainier Industries 1 item
  41. Reptilia Corp 1 item
  42. RogueOps 1 item
  43. Sharps Bros 1 item
  44. Sig Sauer 1 item
  45. SLR Rifleworks 1 item
  46. Strike Industries 1 item
  47. Superlative Arms 1 item
  48. TruCalibre 3 items
  49. Tyrant Designs 1 item
  50. V Seven Weapon Systems 10 items
  51. VLTOR 1 item
  52. White Label Armory 1 item
Model
  1. CZ Scorpion 4 items
Mount
  1. KeyMod 1 item
  2. M-LOK 14 items
  3. Picatinny 10 items
Option
  1. AK-47/74 2 items
  2. AR-10 3 items
  3. AR-15 15 items
  4. Standard 1 item
  5. Bull's Eye 1 item
  6. Vertical Lines 1 item
  7. Minimal 1 item
  8. 1.125-28 TPI 3 Lug/Booster Adaptor 1 item
  9. 1.180-24 TPI 3 Lug/Booster Adaptor 1 item
  10. CZ 5 items
  11. Holed 1 item
  12. Profile 1 item
  13. Green Laser 1 item
  14. Non-Adjustable 7 items
Platform
  1. AR-15 12 items
  2. AK47/74 1 item
  3. CZ 4 items
Product Type
  1. Accessory 3 items
  2. Adapter Plate 1 item
  3. AK Handguard 1 item
  4. Angled Grip 4 items
  5. AR-15 Charging Handle 2 items
  6. AR-15 Stripped Upper Receiver 1 item
  7. Bolt Catch 6 items
  8. Buffer 1 item
  9. Buffer Tube 3 items
  10. Castle Nut 1 item
  11. Castle Nut / End Plate 2 items
  12. Charging Handle 1 item
  13. Compensator 1 item
  14. Dust Cover 1 item
  15. Firing Pin 3 items
  16. Flash Hider 1 item
  17. Forearm Accesory 2 items
  18. Forward Assist 5 items
  19. Gas Block 10 items
  20. Handguard 2 items
  21. Handstop 15 items
  22. Lower Parts Kit 5 items
  23. Magazine Catch 2 items
  24. Magazine Release 3 items
  25. Muzzle Device Accessory 2 items
  26. Parts Kit 1 item
  27. Pistol Grip 12 items
  28. Rail Adapter 3 items
  29. Rail Panel 1 item
  30. Safety Selector 7 items
  31. Sight Post 2 items
  32. Spring 1 item
  33. Stock 4 items
  34. Stock Accessory 3 items
  35. Stock Adapter 3 items
  36. Take Down / Pivot Pins 11 items
  37. Trigger 4 items
  38. Trigger Guard 1 item
  39. Vertical Grip 3 items
Rail Length
  1. 7.3" 1 item
  2. 7.8" 1 item
  3. 10" 1 item
  4. 12" 3 items
  5. 12.6" 1 item
Size
  1. 3" 1 item
  2. 6" 1 item
  3. 3 Slot 1 item
  4. 5 Slot 2 items
  5. 9 Slot 4 items
Thread Pitch
  1. 1/2x28 (9mm) 1 item
  2. 1/2x28 (.22 cal) 2 items
Stock Status
  1. In stock 92 items
  2. Out of stock 46 items
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