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Parts

Our amazing offer consists of a great variety of AR-10, AR-15, and pistol parts and accessories. Purchase upper receivers, muzzle devices, handguards, BCG, barrels, triggers, magazine extensions, etc., and start modifying your firearm today.

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Firearm parts

Rainier Arms is the best place to purchase parts and accessories for your rifle or pistol online, and all that for more than affordable prices. Look no further, you can find here everything that comes to your mind and more! The best manufacturers in the business, like Killer Innovations, Lantac, Next Level Armament, Rainier Arms LLC, Apex Tactical Specialties, and many more are here to offer you their high-quality products. Select your preferred part and make your AR-10, AR-15 or pistol a unique piece of firearm.

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Barrel Length
  1. 4.02" 1 item
  2. 4.5" 1 item
Caliber
  1. .45 ACP 1 item
  2. 9mm 46 items
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  4. Gen 1-3 1 item
  5. Gen 3 15 items
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  7. GEN 4/5 1 item
  8. Gen 5 9 items
  9. Glock .40 cal Gen4 1 item
  10. Glock 9mm Gen4 1 item
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  15. Mid Line 1 item
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  19. G42 1 item
  20. G43 6 items
  21. Tritium Stealth Sights 1 item
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  20. Stainless Steel 1 item
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  23. Titanium Nitride (TiN) 26 items
  24. Titanium-Carbo Nitride (TiCN) 1 item
  25. Molecular Dense Coating (MDC) 10 items
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  1. Aeroknox 1 item
  2. Agency Arms 22 items
  3. Apex Tactical Specialties 15 items
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  5. Armaspec 1 item
  6. Arms Republic 1 item
  7. Battle Arms Development 6 items
  8. CAA 3 items
  9. CMC Triggers 2 items
  10. Danger Close Armament 1 item
  11. Devil Dog Concepts 3 items
  12. DPM Systems Technologies 7 items
  13. Faction 1 item
  14. Faxon Firearms 3 items
  15. Fortis MFG 2 items
  16. Kagwerks 1 item
  17. Killer Innovations 22 items
  18. L2D Combat 11 items
  19. Lantac 9 items
  20. Magpul Industries 3 items
  21. NIGHT FISION 7 items
  22. Nomad Defense 5 items
  23. Norsso 4 items
  24. Polymer80 1 item
  25. Radian Weapons 1 item
  26. Rainier Arms, LLC 10 items
  27. Reptilia Corp 1 item
  28. Sprinco (Tactical Springs) 4 items
  29. Strike Industries 2 items
  30. Swampfox 1 item
  31. Tam Tamography 1 item
  32. Timney Triggers 2 items
  33. Trinity Nevada 3 items
  34. True Precision 9 items
  35. TXC Holsters 1 item
  36. Tyrant Designs 26 items
  37. ZEV Technologies 1 item
Model
  1. Glock 17 77 items
  2. Glock 19 104 items
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  5. Glock 21 7 items
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  7. Glock 23 33 items
  8. Glock 24 16 items
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  10. Glock 26 31 items
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  27. Glock 43 24 items
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  30. Glock 45 14 items
  31. Glock 48 16 items
  32. Nomad 9 1 item
  33. Sig P320 1 item
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  6. $500.00 - $599.99 1 item
  7. $600.00 - $699.99 4 items
  8. $700.00 and above 2 items
Product Type
  1. Basepad 3 items
  2. Compensator 14 items
  3. Extended Slide Stop 1 item
  4. Firing Pin 1 item
  5. Guide Rod 15 items
  6. Handgun Barrel 38 items
  7. Handgun Sights 5 items
  8. Holster 1 item
  9. Locking Block 1 item
  10. Magazine Release 8 items
  11. Magwell 17 items
  12. Parts Kit 2 items
  13. Pistol Accessory 4 items
  14. Pistol Frame 1 item
  15. Pistol Part 16 items
  16. Pistol Sights 9 items
  17. Recoil Spring 1 item
  18. Slide 26 items
  19. Slide Parts Kit 3 items
  20. Slide Plate 5 items
  21. Stabilizer Kit 3 items
  22. Trigger 25 items
Size
  1. Compact 4 items
  2. Full 2 items
Thread Pitch
  1. 1/2x28 (9mm) 20 items
Threaded
  1. Yes 1 item
  2. No 2 items
Twist Rate
  1. 1:10 30 items
Stock Status
  1. In stock 157 items
  2. Out of stock 40 items
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What are the most common barrel thread patterns for pistols and rifles?

For .22LR, .22MAG, .17HMR, 9mm, and .223/5.56 NATO the most common thread pattern would be 1/2x28, with some exceptions for 9mm and .223/5.56 NATO firearms. As for .308/7.62mm and .338 Lapua Magnum, the thread pattern that is most commonly used is 5/8x24, with a few exceptions. Another typical thread pattern is 9/16x24 and it is mostly used for .40 S&W weapons.

Single triggers or two-stage triggers?

Whichever you choose, you cannot go wrong. The single trigger is fast and simple to use; as soon as you apply a small amount of pressure, the firearm goes off. Two-stage trigger is extremely accurate and you know precisely when the shot is going to be fired. The first stage prepares you for the second one, when the trigger pushes the hammer up causing the firearm to discharge. So, it is up to you to make a choice.

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