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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. Midwest Industries Marlin 336 Handguard Adaptor
    Midwest Industries Marlin 336 Handguard Adaptor
    $36.95
    Out of stock
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  2. 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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  3. 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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  5. ERGO Flat Top Tactical Deluxe Grip Black
    ERGO Flat Top Tactical Deluxe Grip Black
    $33.99
    Out of stock
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  7. V Seven Weapon Systems Titanium Firing Pin AR-15
    V Seven Weapon Systems Titanium Firing Pin AR-15
    $31.04
    Out of stock
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  9. SLR M-LOK RAIL SECTION
    SLR M-LOK RAIL SECTION
    Out of stock
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  10. Shooters Element CZ Scorpion Flat Trigger - Black
    Shooters Element CZ Scorpion Flat Trigger - Black
    $33.25
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  11. Shooters Element CZ Scorpion Flat Trigger - Red
    Shooters Element CZ Scorpion Flat Trigger - Red
    $37.99
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  12. Shooters Element CZ Scorpion Flat Trigger
    Shooters Element CZ Scorpion Flat Trigger
    Out of stock
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  13. Young Mfg Aluminum Railed Gas Block - .750
    Young Mfg Aluminum Railed Gas Block - .750
    $39.00
    Out of stock
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  14. Magpul BAD Lever
    Magpul BAD Lever
    $31.30
    Out of stock
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  15. Aeroknox Micro-Stop - M-Lok
    Aeroknox Micro-Stop - M-Lok
    $35.00
    Out of stock
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  16. Aeroknox Field Pins
    Aeroknox Field Pins
    $37.00
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Items 97-112 of 133

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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. Parts & Kits 43 items
  2. Buffer Systems 4 items
  3. Trigger Parts 8 items
  4. Gas Systems 12 items
  5. Muzzle Devices 4 items
  6. Bolt Parts 5 items
  7. Grips 30 items
  8. Charging Handles 3 items
  9. Rifle Handguards 11 items
  10. Stocks & Braces 10 items
  11. 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 2 items
  8. Ascalon Arms 2 items
  9. Battle Arms Development 6 items
  10. Blitzkrieg Components 2 items
  11. Bravo Company MFG (BCM) 2 items
  12. Drew Meyers Defense 2 items
  13. Driven Arms Co. 8 items
  14. Elftmann Tactical 1 item
  15. Emissary Development 2 items
  16. Ergo Grips 2 items
  17. Faxon Firearms 3 items
  18. Fortis MFG 6 items
  19. Forward Controls Design 13 items
  20. Gear Head Works 1 item
  21. Griffin Armament 1 item
  22. HB Industries 3 items
  23. HERA ARMS 3 items
  24. JK Armament 1 item
  25. JP Enterprises Inc 3 items
  26. KAK Industries 1 item
  27. Kinetic Development Group 2 items
  28. Knight’s Armament Company (KAC) 1 item
  29. KNS Precision 3 items
  30. Kratos Design Group 1 item
  31. Lantac 2 items
  32. LUTH-AR 1 item
  33. Magpul Industries 8 items
  34. Midwest Industries 1 item
  35. Next Level Armament 2 items
  36. Primary Weapon Systems 1 item
  37. Q, LLC 3 items
  38. Rainier Arms, LLC 2 items
  39. Rainier Industries 1 item
  40. Reptilia Corp 1 item
  41. Sharps Bros 1 item
  42. Sig Sauer 1 item
  43. SLR Rifleworks 1 item
  44. Strike Industries 1 item
  45. Superlative Arms 1 item
  46. TruCalibre 3 items
  47. Tyrant Designs 1 item
  48. V Seven Weapon Systems 10 items
  49. VLTOR 1 item
  50. White Label Armory 1 item
Model
  1. CZ Scorpion 4 items
Mount
  1. KeyMod 1 item
  2. M-LOK 12 items
  3. Picatinny 10 items
Option
  1. AK-47/74 2 items
  2. AR-10 3 items
  3. AR-15 13 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 11 items
  2. CZ 4 items
Product Type
  1. Accessory 3 items
  2. Adapter Plate 1 item
  3. Angled Grip 3 items
  4. AR-15 Charging Handle 2 items
  5. Bolt Catch 6 items
  6. Buffer 1 item
  7. Buffer Tube 3 items
  8. Castle Nut 1 item
  9. Castle Nut / End Plate 2 items
  10. Charging Handle 1 item
  11. Compensator 1 item
  12. Dust Cover 1 item
  13. Firing Pin 3 items
  14. Flash Hider 1 item
  15. Forearm Accesory 2 items
  16. Forward Assist 5 items
  17. Gas Block 10 items
  18. Handguard 2 items
  19. Handstop 14 items
  20. Lower Parts Kit 4 items
  21. Magazine Catch 2 items
  22. Magazine Release 3 items
  23. Muzzle Device Accessory 2 items
  24. Parts Kit 1 item
  25. Pistol Grip 11 items
  26. Rail Adapter 3 items
  27. Rail Panel 1 item
  28. Safety Selector 7 items
  29. Sight Post 2 items
  30. Spring 1 item
  31. Stock 4 items
  32. Stock Accessory 3 items
  33. Stock Adapter 4 items
  34. Take Down / Pivot Pins 11 items
  35. Trigger 4 items
  36. Trigger Guard 1 item
  37. Vertical Grip 2 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 89 items
  2. Out of stock 44 items
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