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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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  1. Platform Glock Remove This Item
  2. Price $0.00 - $999.99 Remove This Item
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  1. 3.9" 1 item
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  3. 4.4" 1 item
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  2. 9mm 78 items
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  23. Molecular Dense Coating (MDC) 10 items
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  1. Aeroknox 1 item
  2. Agency Arms 25 items
  3. Align Tactical 2 items
  4. Apex Tactical Specialties 13 items
  5. ARC Division 3 items
  6. Armaspec 1 item
  7. Arms Republic 2 items
  8. Battle Arms Development 6 items
  9. CAA 3 items
  10. CMC Triggers 2 items
  11. Danger Close Armament 2 items
  12. Devil Dog Concepts 3 items
  13. DPM Systems Technologies 12 items
  14. Empire 1 item
  15. Faction 1 item
  16. Faxon Firearms 6 items
  17. Fortis MFG 2 items
  18. Forward Controls Design 6 items
  19. Grayguns 1 item
  20. Grey Ghost Precision 2 items
  21. Griffin Armament 4 items
  22. Kagwerks 2 items
  23. Killer Innovations 26 items
  24. L2D Combat 4 items
  25. Lantac 6 items
  26. Lone Wolf Arms 10 items
  27. Magpul Industries 3 items
  28. Matrix Arms 2 items
  29. NIGHT FISION 12 items
  30. Nomad Defense 13 items
  31. Norsso 8 items
  32. Noveske 5 items
  33. Polymer80 2 items
  34. Radian Weapons 2 items
  35. Rainier Arms, LLC 4 items
  36. Reptilia Corp 1 item
  37. SCT Manufacturing 4 items
  38. Spinta Precision 3 items
  39. Sprinco (Tactical Springs) 5 items
  40. Strike Industries 4 items
  41. Swampfox 1 item
  42. Tactical Development 1 item
  43. Tam Tamography 1 item
  44. Taran Tactical Innovations 4 items
  45. Timney Triggers 4 items
  46. Trinity Nevada 4 items
  47. True Precision 8 items
  48. TruGlo 2 items
  49. Tyrant Designs 29 items
  50. Zaffiri Precision 2 items
  51. ZEV Technologies 1 item
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  1. Glock 17 99 items
  2. Glock 19 136 items
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  6. Glock 22 38 items
  7. Glock 23 38 items
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  11. Glock 27 25 items
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  23. Glock 39 16 items
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  25. Glock 41 7 items
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  27. Glock 43 28 items
  28. Glock 43X 21 items
  29. Glock 44 6 items
  30. Glock 45 20 items
  31. Glock 47 4 items
  32. Glock 48 23 items
  33. Sig P320 1 item
  34. Sig P365 1 item
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Option
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  2. 6lb 1 item
  3. 6.5lb 1 item
  4. 4lb 1 item
  5. (Green) - 13 lbs 1 item
  6. (Blue) - 15 lbs 1 item
  7. (Red) - 18 lbs 1 item
  8. Glock 157 items
  9. Sig Sauer 1 item
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  2. $100.00 - $199.99 81 items
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  7. $600.00 - $699.99 3 items
  8. $700.00 - $799.99 4 items
  9. $800.00 and above 3 items
Product Type
  1. Accessory 2 items
  2. Adapter Plate 1 item
  3. Backplate 1 item
  4. Barrel 2 items
  5. Basepad 4 items
  6. Charging Handle 1 item
  7. Compensator 17 items
  8. Extended Slide Stop 1 item
  9. Firing Pin 1 item
  10. Guide Rod 16 items
  11. Handgun Barrel 58 items
  12. Handgun Sights 16 items
  13. Locking Block 1 item
  14. Magazine Catch 2 items
  15. Magazine Release 5 items
  16. Magwell 21 items
  17. Parts Kit 1 item
  18. Pistol Accessory 5 items
  19. Pistol Frame 11 items
  20. Pistol Part 14 items
  21. Pistol Sights 6 items
  22. Recoil Spring 7 items
  23. Slide 40 items
  24. Slide Parts Kit 4 items
  25. Slide Plate 5 items
  26. Spring 3 items
  27. Stabilizer Kit 3 items
  28. Thumb Rest 2 items
  29. Trigger 24 items
Size
  1. Compact 4 items
  2. Full 2 items
Thread Pitch
  1. 1/2x28 (9mm) 35 items
Threaded
  1. Yes 7 items
  2. No 9 items
Twist Rate
  1. 1:10 47 items
  2. 1:16 3 items
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  1. In stock 270 items Remove This Item
  2. Out of stock 1 item
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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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