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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. AeroKnox Hook-Stop MLOK
    AeroKnox Hook-Stop MLOK
    $42.50
    Out of stock
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  2. Next Level Armament MCX Spring Plate
    Next Level Armament MCX Spring Plate
    $43.00
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  3. NorthTech Defense Titanium Forward Assist
    NorthTech Defense Titanium Forward Assist
    $47.45
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  4. VLTOR 6 Position Receiver Extension - RE-10
    VLTOR 6 Position Receiver Extension - RE-10
    $49.46
    Out of stock
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  5. VLTOR 7 Position Receiver Extension - A5
    VLTOR 7 Position Receiver Extension - A5
    $49.46
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  6. TruCalibre AR-15 Enhanced Safety Selector
    TruCalibre AR-15 Enhanced Safety Selector
    $43.00
    Out of stock
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  7. RS Regulate Optional Smooth End Cap
    RS Regulate Optional Smooth End Cap
    $44.00
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  8. JMAC Customs 1913 Adapter - Yugo
    JMAC Customs 1913 Adapter - Yugo
    $44.96
    Out of stock
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  12. HB Industries B&T GHM9 Charging Handle - Black
    HB Industries B&T GHM9 Charging Handle - Black
    $41.58
    Out of stock
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  14. HB Industries CZ Bren 2 Trigger - Black
    HB Industries CZ Bren 2 Trigger - Black
    $48.51
    Out of stock
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Items 97-110 of 110

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Barrel Length
  1. 16" 3 items
  2. 18" 1 item
Caliber
  1. 9mm 2 items
Category
  1. Parts & Kits 41 items
  2. Buffer Systems 11 items
  3. Trigger Parts 1 item
  4. Gas Systems 2 items
  5. Muzzle Devices 6 items
  6. Grips 21 items
  7. Charging Handles 9 items
  8. Rifle Handguards 7 items
  9. Stocks & Braces 8 items
  10. MILSPEC Parts 2 items
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  1. AR-15 1 item
  2. Left 1 item
  3. M-LOK 2 items
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  1. DLC 1 item
  2. Anodize 3 items
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  1. Mid 3 items
  2. Intermediate 1 item
Manufacturer
  1. A3 Tactical 3 items
  2. Aero Precision 3 items
  3. Aeroknox 1 item
  4. Armaspec 2 items
  5. B5 Systems 1 item
  6. Battle Arms Development 1 item
  7. Blitzkrieg Components 2 items
  8. Bravo Company MFG (BCM) 4 items
  9. Driven Arms Co. 6 items
  10. Emissary Development 2 items
  11. Ergo Grips 2 items
  12. F-1 Firearms 1 item
  13. Fortis MFG 7 items
  14. Forward Controls Design 12 items
  15. HB Industries 9 items
  16. Heresy Design 1 item
  17. Hiperfire 2 items
  18. JK Armament 2 items
  19. JMAC Customs 2 items
  20. KNS Precision 1 item
  21. Kaw Valley Precision 1 item
  22. Magpul Industries 6 items
  23. Maxim Defense 2 items
  24. Midwest Industries 1 item
  25. Mission First Tactical 1 item
  26. NEMO Arms 1 item
  27. Next Level Armament 2 items
  28. Odin Works 1 item
  29. Patriot Ordnance Factory (POF) 1 item
  30. Primary Weapon Systems 1 item
  31. Q, LLC 1 item
  32. Rainier Arms, LLC 5 items
  33. Rainier Industries 1 item
  34. Rise Armament 3 items
  35. RS Regulate 1 item
  36. Strike Industries 2 items
  37. TruCalibre 1 item
  38. True North Concepts 3 items
  39. Tyrant Designs 1 item
  40. V Seven Weapon Systems 4 items
  41. VLTOR 3 items
Model
  1. CZ Bren 3 items
  2. CZ Scorpion 2 items
Mount
  1. KeyMod 3 items
  2. M-LOK 12 items
  3. Other 1 item
  4. Picatinny 5 items
Option
  1. AK-47/74 1 item
  2. AR-9 1 item
  3. AR-10 1 item
  4. AR-15 9 items
  5. 4.720" 2 items
  6. 6.295" 2 items
  7. 7.870" 2 items
  8. 9.445" 2 items
  9. CZ 1 item
  10. Non-Adjustable 2 items
Platform
  1. AR-15 2 items
  2. CZ 2 items
  3. H&K 1 item
Product Type
  1. Adapter Plate 1 item
  2. Angled Grip 6 items
  3. AR-15 Charging Handle 1 item
  4. Buffer 5 items
  5. Buffer Kit 1 item
  6. Buffer Tube 6 items
  7. Castle Nut / End Plate 2 items
  8. Charging Handle 9 items
  9. Dust Cover 6 items
  10. End Cap 2 items
  11. End Plate 2 items
  12. Flash Hider 3 items
  13. Forearm Accesory 1 item
  14. Forward Assist 2 items
  15. Front Sight 1 item
  16. Gas Block 2 items
  17. Grip Accessory 1 item
  18. Gunsmithing Tool 1 item
  19. Handguard 2 items
  20. Handguard Adaptor 1 item
  21. Handstop 12 items
  22. Lower Parts Kit 4 items
  23. Magazine Catch 1 item
  24. Magazine Release 1 item
  25. Magwell 3 items
  26. Muzzle Brake 3 items
  27. Muzzle Device Accessory 1 item
  28. Parts Kit 1 item
  29. Pistol Grip 3 items
  30. Port Door 1 item
  31. Rail Adapter 2 items
  32. Safety Selector 11 items
  33. Sight Post 2 items
  34. Sling Mount 1 item
  35. Stock 6 items
  36. Stock Adapter 1 item
  37. Take Down / Pivot Pins 1 item
  38. Trigger 1 item
Rail Length
  1. 10" 3 items
  2. 12" 1 item
Size
  1. 9 Slot 4 items
Thread Pitch
  1. 1/2x28 (.22 cal) 1 item
  2. 5/8x24 (.30 cal) 1 item
  3. M13.5x1 LH 1 item
Threaded
  1. Yes 1 item
Stock Status
  1. In stock 75 items
  2. Out of stock 35 items
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