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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.

Parts

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  1. Taran Tactical Innovations Grand Master Connector Kit for Gen 3 Glock - Competition
    Taran Tactical Innovations Grand Master Connector Kit for Gen 3 Glock - Competition
    $44.99
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  2. Taran Tactical Innovations Grand Master Connector Kit for Gen 4 Glock - Competition
    Taran Tactical Innovations Grand Master Connector Kit for Gen 4 Glock - Competition
    $44.99
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  3. Taran Tactical Innovations Grand Master Connector Kit for Gen 4 Glock - Carry
    Taran Tactical Innovations Grand Master Connector Kit for Gen 4 Glock - Carry
    $39.99
    Out of stock
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  4. Taran Tactical Innovations Grand Master Connector Kit for Gen 5 Glock - Competition
    Taran Tactical Innovations Grand Master Connector Kit for Gen 5 Glock - Competition
    $44.99
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  5. Taran Tactical Innovations Grand Master Connector Kit for Gen 5 Glock - Carry
    Taran Tactical Innovations Grand Master Connector Kit for Gen 5 Glock - Carry
    $39.99
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  6. Apex Tactical Specialties Polymer Enhancement Trigger Kit for Glock Gen 3 & 4
    Apex Tactical Specialties Polymer Enhancement Trigger Kit for Glock Gen 3 & 4
    Out of stock
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  7. Agency Arms Icarus Sig P320 X-Carry Grip Module - Black
    Agency Arms Icarus Sig P320 X-Carry Grip Module - Black
    $520.00
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  8. Empire Ronin Top Cover for B&T TP9 - Black
    Empire Ronin Top Cover for B&T TP9 - Black
    $324.99
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  9. Tyrant Design Sig Sauer P365 Magazine Extension
    Tyrant Design Sig Sauer P365 Magazine Extension
    Out of stock
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  10. Sharps Bros 365X-Improved RMSC Optic Ready & Integrated Comp Slide for Sig P365X
    Sharps Bros 365X-Improved RMSC Optic Ready & Integrated Comp Slide for Sig P365X
    Special Price $315.99 Regular Price $366.23
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  11. Empire Katana Magwell For Sig Sauer P320 X-Series - Tano
    Empire Katana Magwell For Sig Sauer P320 X-Series - Tano
    Out of stock
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  12. L2D Combat Precision Match Fluted Barrel for Glock 34 Gen 3/4
    L2D Combat Precision Match Fluted Barrel for Glock 34 Gen 3/4
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  13. L2D Combat Precision Match Fluted Threaded Barrel For Glock 17 Gen 5
    L2D Combat Precision Match Fluted Threaded Barrel For Glock 17 Gen 5
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  14. L2D Combat Tyton Stripped Slide for Glock 17 - DLC Black
    L2D Combat Tyton Stripped Slide for Glock 17 - DLC Black
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  15. L2D Combat Tyton Stripped Slide For Glock 19 Gen 5 - DLC Black
    L2D Combat Tyton Stripped Slide For Glock 19 Gen 5 - DLC Black
    Special Price $314.99 Regular Price $450.00
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  16. Angstadt Arms 9mm 3-Lug Adapter - 1/2x28
    Angstadt Arms 9mm 3-Lug Adapter - 1/2x28
    $36.00
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Items 49-64 of 229

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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. 9mm 27 items
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  1. Pistol parts 222 items
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  22. Lantac 10 items
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  28. Rainier Arms, LLC 6 items
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  31. Sig Sauer 12 items
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  34. Springer Precision 5 items
  35. Stoeger 1 item
  36. Tactical Development 8 items
  37. Taran Tactical Innovations 12 items
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  42. Wilson Combat 1 item
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  15. Glock 26 8 items
  16. Glock 27 7 items
  17. Glock 28 3 items
  18. Glock 29 3 items
  19. Glock 30 3 items
  20. Glock 31 8 items
  21. Glock 32 7 items
  22. Glock 33 7 items
  23. Glock 34 10 items
  24. Glock 35 8 items
  25. Glock 36 1 item
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  27. Glock 38 3 items
  28. Glock 39 3 items
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  31. Glock 42 1 item
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  35. Glock 45 5 items
  36. Glock 48 7 items
  37. H&K VP9 1 item
  38. Nomad 9 4 items
  39. Sig P220 1 item
  40. Sig P226 1 item
  41. Sig P229 1 item
  42. Sig P238 1 item
  43. Sig P320 50 items
  44. Sig P365 19 items
  45. Sig P365X 3 items
  46. Sig P365XL 11 items
  47. Sig P365 X-Macro 1 item
  48. Sig P938 1 item
  49. Sig MPX 1 item
  50. S&W M&P 1 item
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  52. S&W M&P Shield 3 items
  53. Springfield Hellcat 1 item
  54. Stoeger STR-9 1 item
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  11. Left-Hand 1 item
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  7. Sig Sauer 81 items
  8. Smith & Wesson 6 items
  9. Springfield 2 items
  10. Stoeger 1 item
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  1. $0.00 - $999.99 228 items
  2. $1,000.00 and above 1 item
Product Type
  1. Accessory 4 items
  2. Barrel 29 items
  3. Basepad 3 items
  4. Charging Handle 2 items
  5. Compensator 16 items
  6. Extended Slide Stop 1 item
  7. Firing Pin 1 item
  8. Grip Accessory 1 item
  9. Grip Module 8 items
  10. Guide Rod 3 items
  11. Holster 1 item
  12. Iron Sight 1 item
  13. Locking Block 1 item
  14. Magazine 3 items
  15. Magazine Extension 3 items
  16. Magazine Release 6 items
  17. Magwell 15 items
  18. Muzzle Device Accessory 2 items
  19. Optic Plate 1 item
  20. Parts Kit 3 items
  21. Pistol Accessory 1 item
  22. Pistol Frame 10 items
  23. Pistol Part 15 items
  24. Pistol Sights 9 items
  25. Recoil Spring 3 items
  26. Safety Selector 1 item
  27. Slide 46 items
  28. Slide Parts Kit 3 items
  29. Spring 1 item
  30. Top Cover 1 item
  31. Trigger 23 items
  32. Upper Parts Kit 2 items
Size
  1. 3 Slot 1 item
  2. 5 Slot 1 item
  3. 9 Slot 1 item
  4. X-Compact 2 items
  5. Full 1 item
Thread Pitch
  1. 1/2x28 14 items
Threaded
  1. Yes 4 items
  2. No 5 items
Twist Rate
  1. 1:10 6 items
Stock Status
  1. Out of stock 229 items Remove This 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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