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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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Items 17-32 of 107

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  2. Strike Industries AR-15 Mil-Spec Buffer Housing
    Strike Industries AR-15 Mil-Spec Buffer Housing
    $16.95
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  5. Forward Controls Design CNF Billet Castle Nut
    Forward Controls Design CNF Billet Castle Nut
    $19.00 - $28.50
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  11. Reptilia Corp AR-15/SR-25 CQG-NB No Backstrap Pistol Grip
    Reptilia Corp AR-15/SR-25 CQG-NB No Backstrap Pistol Grip
    $19.76
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  16. Fortis MFG Contractor Series Billet Magazine Catch
    Fortis MFG Contractor Series Billet Magazine Catch
    $18.95
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Items 17-32 of 107

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  1. Price $10.00 - $19.99 Remove This Item
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Barrel Length
  1. 18" 1 item
Caliber
  1. .223/5.56 1 item
  2. .308 1 item
Category
  1. Parts & Kits 31 items
  2. Buffer Systems 6 items
  3. Trigger Parts 6 items
  4. Gas Systems 5 items
  5. Muzzle Devices 1 item
  6. Bolt Parts 1 item
  7. Grips 28 items
  8. Charging Handles 1 item
  9. Rifle Handguards 8 items
  10. Stocks & Braces 12 items
  11. MILSPEC Parts 4 items
Color
Configuration
  1. AR-15 1 item
  2. Rifle 1 item
Finish
  1. Black 2 items
  2. FDE 2 items
  3. NiB-X 1 item
  4. Nitride 1 item
  5. Nitromet 2 items
Gas Block Diameter
  1. .750" 1 item
Gas Length
  1. Pistol -1 2 items
  2. Pistol 3 items
  3. Carbine 4 items
  4. Micro 1 item
  5. Mid 3 items
  6. Intermediate 4 items
  7. Patrol 1 item
  8. Rifle 3 items
  9. Rifle +1 2 items
  10. Rifle +2 2 items
Height
  1. Low 1 item
  2. Medium 1 item
  3. High 1 item
Is Firearms?
  1. No 107 items
Magazine Capacity
  1. 32rd 1 item
Manufacturer
  1. Advanced Armament Company (AAC) 1 item
  2. ALG Defense 1 item
  3. Andro Corp Industries 1 item
  4. Armaspec 1 item
  5. Arms Republic 1 item
  6. B5 Systems 3 items
  7. Battle Arms Development 2 items
  8. Blitzkrieg Components 3 items
  9. Bravo Company MFG (BCM) 7 items
  10. Brigand Arms 1 item
  11. Chisel Machining 1 item
  12. Flatline Fiber Co 1 item
  13. Fortis MFG 2 items
  14. Forward Controls Design 4 items
  15. Gear Head Works 1 item
  16. HERA ARMS 4 items
  17. JP Enterprises Inc 1 item
  18. KNS Precision 2 items
  19. Krebs Customs 1 item
  20. Leitner-Wise 1 item
  21. Magpul Industries 21 items
  22. Mission First Tactical 1 item
  23. NEMO Arms 1 item
  24. Neverwear Springs 1 item
  25. Noveske 1 item
  26. Rainier Arms, LLC 3 items
  27. Rainier Industries 1 item
  28. Reptilia Corp 3 items
  29. Riflespeed 1 item
  30. Rise Armament 1 item
  31. Seekins Precision 2 items
  32. Sprinco (Tactical Springs) 4 items
  33. Strike Industries 13 items
  34. Tango Down 1 item
  35. Taran Tactical Innovations 1 item
  36. Underground Tactical 1 item
  37. V Seven Weapon Systems 5 items
  38. WMD Guns 3 items
Mount
  1. M-LOK 5 items
  2. Other 1 item
  3. Picatinny 8 items
Option
  1. AR-10 2 items
  2. AR-15 3 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. Non-Adjustable 1 item
  11. Dimpled 2 items
  12. Serrated 2 items
Platform
  1. AR-15 3 items
  2. AK47/74 3 items
Product Type
  1. Accessory 1 item
  2. Angled Grip 3 items
  3. Anti Walk Pins 2 items
  4. Bolt Catch 1 item
  5. Brace Strap 1 item
  6. Buffer 4 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 4 items
  13. End Plate 3 items
  14. Forearm Accesory 4 items
  15. Forward Assist 2 items
  16. Gas Block 1 item
  17. Gas Tube 4 items
  18. Grip Accessory 5 items
  19. Grip Screw 1 item
  20. Handstop 1 item
  21. Magazine 1 item
  22. Magazine Catch 1 item
  23. Magazine Release 3 items
  24. Parts Kit 2 items
  25. Pistol Grip 12 items
  26. Port Door 1 item
  27. Port Door Rod 3 items
  28. Rail Panel 6 items
  29. Rail Section 1 item
  30. Recoil Spring 1 item
  31. Retainer Pin 4 items
  32. Safety Selector 2 items
  33. Shim Set 1 item
  34. Sight Post 3 items
  35. Spring 4 items
  36. Stock 1 item
  37. Stock Accessory 6 items
  38. Stock Adapter 1 item
  39. Trigger / Hammer Pins 1 item
  40. Trigger Guard 3 items
  41. Upper Parts Kit 1 item
  42. Vertical Grip 7 items
Rail Length
  1. 12" 1 item
Size
  1. Medium 1 item
  2. Large 1 item
  3. 3 Slot 1 item
  4. 5 Slot 1 item
  5. 9 Slot 2 items
Thread Pitch
  1. 1/2x28 1 item
  2. 3/4x24 1 item
  3. 5/8x24 1 item
Stock Status
  1. In stock 107 items Remove This Item
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