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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. Hera Arms AR15 Grip
    Hera Arms AR15 Grip
    Out of stock
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  2. Noveske Rifleworks AR15 Port Door
    Noveske Rifleworks AR15 Port Door
    Out of stock
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  3. Battle Arms Development Magazine Release Kit - EMR
    Battle Arms Development Magazine Release Kit - EMR
    $15.95
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  4. Battle Arms Development Enhanced Bolt Catch - Investment Cast
    Battle Arms Development Enhanced Bolt Catch - Investment Cast
    $13.95
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  5. Milspec/GI Carbine Buffer - 3.0oz
    Milspec/GI Carbine Buffer - 3.0oz
    $12.00
    Out of stock
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  6. Arms Republic M-LOK Rail - 5-Slot
    Arms Republic M-LOK Rail - 5-Slot
    $12.30
    Out of stock
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  7. Aero Precision AR10/AR15 Fix It Kit
    Aero Precision AR10/AR15 Fix It Kit
    $17.99
    Out of stock
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  8. Battle Arms Development Investment Cast Enhanced Bolt Catch - .308
    Battle Arms Development Investment Cast Enhanced Bolt Catch - .308
    $15.95
    Out of stock
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  9. ERGO 4 Slot M-LOK Slot Cover 4 Pack
    ERGO 4 Slot M-LOK Slot Cover 4 Pack
    Out of stock
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  10. V Seven Weapon Systems Titanium Buffer Retainer Pin
    V Seven Weapon Systems Titanium Buffer Retainer Pin
    $12.61
    Out of stock
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  11. V Seven Weapon Systems Port Door Rod AR15
    V Seven Weapon Systems Port Door Rod AR15
    $13.58
    Out of stock
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  12. Noveske NSR Polymer Panel Set - Foliage Green
    Noveske NSR Polymer Panel Set - Foliage Green
    $11.35
    Out of stock
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  13. Griffin Armament C2E Contour Connect End Plate - QD
    Griffin Armament C2E Contour Connect End Plate - QD
    $17.95
    Out of stock
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  14. Delta Ring Assembly: AR15
    Delta Ring Assembly: AR15
    $10.50
    Out of stock
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  15. Elftmann Tactical AR-15 Non-Rotational Anti-Walk Pins
    Elftmann Tactical AR-15 Non-Rotational Anti-Walk Pins
    $19.95
    Out of stock
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  16. WMD Guns AR-15 Forward Assist Assembly
    WMD Guns AR-15 Forward Assist Assembly
    Out of stock
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Items 113-128 of 139

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Barrel Length
  1. 18" 3 items
Caliber
  1. .223/5.56 1 item
  2. .308 1 item
Category
  1. Parts & Kits 45 items
  2. Buffer Systems 6 items
  3. Trigger Parts 10 items
  4. Gas Systems 5 items
  5. Muzzle Devices 1 item
  6. Bolt Parts 2 items
  7. Grips 32 items
  8. Charging Handles 1 item
  9. Rifle Handguards 15 items
  10. Stocks & Braces 12 items
  11. MILSPEC Parts 5 items
Color
Configuration
  1. AR-15 3 items
  2. Cross 1 item
  3. Flaming Pig 1 item
  4. Ghetto Blaster 1 item
  5. M-LOK 1 item
  6. Rifle 1 item
Finish
  1. Black 4 items
  2. FDE 2 items
  3. NiB-X 2 items
  4. Nitride 1 item
  5. Nitromet 3 items
Gas Block Diameter
  1. .750" 1 item
Gas System Length
  1. Pistol -1 2 items
  2. Pistol 3 items
  3. Carbine 4 items
  4. Micro 1 item
  5. Mid 3 items
  6. Intermediate 6 items
  7. Patrol 1 item
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  9. Rifle +1 2 items
  10. Rifle +2 2 items
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  1. Low 1 item
  2. Medium 1 item
  3. High 1 item
Magazine Capacity
  1. 32rd 1 item
Manufacturer
  1. A3 Tactical 1 item
  2. Advanced Armament Company (AAC) 1 item
  3. Aero Precision 1 item
  4. ALG Defense 1 item
  5. Andro Corp Industries 1 item
  6. Armaspec 2 items
  7. Arms Republic 2 items
  8. Ascalon Arms 1 item
  9. B5 Systems 4 items
  10. Battle Arms Development 6 items
  11. Blitzkrieg Components 4 items
  12. Bravo Company MFG (BCM) 8 items
  13. Brigand Arms 1 item
  14. Chisel Machining 1 item
  15. Drew Meyers Defense 1 item
  16. Elftmann Tactical 1 item
  17. Ergo Grips 1 item
  18. Flatline Fiber Co 1 item
  19. Fortis MFG 2 items
  20. Forward Controls Design 4 items
  21. Gear Head Works 1 item
  22. Geissele 1 item
  23. Griffin Armament 1 item
  24. HB Industries 1 item
  25. HERA ARMS 5 items
  26. James Madison Tactical (JMT) 1 item
  27. JP Enterprises Inc 2 items
  28. KNS Precision 2 items
  29. Krebs Customs 1 item
  30. Leitner-Wise 1 item
  31. Magpul Industries 24 items
  32. Mission First Tactical 1 item
  33. NEMO Arms 1 item
  34. Neverwear Springs 1 item
  35. Noveske 3 items
  36. Obsidian Arms 1 item
  37. Patriot Ordnance Factory (POF) 1 item
  38. Rainier Arms, LLC 3 items
  39. Rainier Industries 1 item
  40. Reptilia Corp 3 items
  41. Riflespeed 1 item
  42. Rise Armament 1 item
  43. Seekins Precision 2 items
  44. Sprinco (Tactical Springs) 4 items
  45. Strike Industries 13 items
  46. Tango Down 1 item
  47. Taran Tactical Innovations 1 item
  48. TruCalibre 1 item
  49. Underground Tactical 1 item
  50. V Seven Weapon Systems 5 items
  51. WMD Guns 4 items
Model
  1. CZ Scorpion 2 items
Mount
  1. M-LOK 11 items
  2. Other 1 item
  3. Picatinny 10 items
Option
  1. AR-10 3 items
  2. AR-15 8 items
  3. White - Standard Power 1 item
  4. Blue - Enhanced Power 1 item
  5. Red - Extra Power 1 item
  6. Orange - Extra Extra Power 1 item
  7. Yellow - Reduced Power 1 item
  8. White/Red - Intermediate Power 1 item
  9. Green - Rifle Length Standard Power 1 item
  10. CZ 1 item
  11. Non-Adjustable 1 item
  12. Dimpled 2 items
  13. Serrated 2 items
Platform
  1. AR-15 4 items
  2. AK47/74 3 items
  3. CZ-USA 2 items
Product Type
  1. Accessory 1 item
  2. Angled Grip 4 items
  3. Anti Walk Pins 5 items
  4. Bolt Catch 4 items
  5. Brace Strap 1 item
  6. Buffer 5 items
  7. Buffer Spring 2 items
  8. Cam Pin 1 item
  9. Castle Nut 1 item
  10. Charging Handle 1 item
  11. Cheek Riser 3 items
  12. Dust Cover 5 items
  13. End Plate 5 items
  14. Firing Pin 1 item
  15. Forearm Accesory 8 items
  16. Forward Assist 2 items
  17. Gas Block 1 item
  18. Gas Tube 4 items
  19. Grip Accessory 5 items
  20. Grip Module 1 item
  21. Grip Screw 1 item
  22. Handstop 3 items
  23. Lower Parts Kit 1 item
  24. Magazine 1 item
  25. Magazine Catch 2 items
  26. Magazine Release 5 items
  27. Parts Kit 2 items
  28. Pistol Grip 12 items
  29. Port Door 2 items
  30. Port Door Rod 3 items
  31. Rail Panel 8 items
  32. Rail Section 2 items
  33. Recoil Spring 1 item
  34. Retainer Pin 4 items
  35. Safety Selector 2 items
  36. Shim Set 2 items
  37. Sight Post 4 items
  38. Spring 5 items
  39. Stock 1 item
  40. Stock Accessory 6 items
  41. Stock Adapter 1 item
  42. Take Down / Pivot Pins 1 item
  43. Trigger / Hammer Pins 2 items
  44. Trigger Guard 3 items
  45. Upper Parts Kit 1 item
  46. Vertical Grip 7 items
Rail Length
  1. 12" 3 items
Size
  1. Medium 1 item
  2. Large 1 item
  3. 3 Slot 2 items
  4. 5 Slot 2 items
  5. 7 Slot 1 item
  6. 9 Slot 4 items
Thread Pitch
  1. 1/2x28 1 item
  2. 3/4x24 1 item
  3. 5/8x24 1 item
Stock Status
  1. In stock 109 items
  2. Out of stock 30 items
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