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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. Sig Sauer Grip Module Assembly P320 X5 - Black Medium
    Sig Sauer Grip Module Assembly P320 X5 - Black Medium
    Special Price $100.99 Regular Price $119.99
    Out of stock
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  2. Lantac SSR Trigger Connector For Glock - 3.5LB
    Lantac SSR Trigger Connector For Glock - 3.5LB
    $15.99
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  3. Springer Precision Sig P320 9mm Open Compensator (1/2 x 28)
    Springer Precision Sig P320 9mm Open Compensator (1/2 x 28)
    $95.00
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  4. L2D Combat Guide Rod Reducing Ring For Glock Gen 4 to Gen 3
    L2D Combat Guide Rod Reducing Ring For Glock Gen 4 to Gen 3
    $13.30
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  5. L2D Combat Enhanced Upper Parts Kit - SS
    L2D Combat Enhanced Upper Parts Kit - SS
    $133.00
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  6. L2D Combat Stainless Steel Fluted Guide Rod Kit Standard Frame for Glock Gen 3
    L2D Combat Stainless Steel Fluted Guide Rod Kit Standard Frame for Glock Gen 3
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  7. Battle Arms Development ONE:1 416R Threaded Barrel For Glock 19 - Stainless Steel
    Battle Arms Development ONE:1 416R Threaded Barrel For Glock 19 - Stainless Steel
    $230.00
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  8. Agency Arms Urban Combat Stripped Slide For Glock 19 Gen 4 - DLC
    Agency Arms Urban Combat Stripped Slide For Glock 19 Gen 4 - DLC
    $950.00
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  9. Lantac GFP-E Upgrade Firing Pin for Glock
    Lantac GFP-E Upgrade Firing Pin for Glock
    $78.99
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  10. Lantac GR-19-S Flared Head Guide Rod for Glock 19
    Lantac GR-19-S Flared Head Guide Rod for Glock 19
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  11. Agency Arms Urban Combat Stripped Slide For Glock 17 Gen 4 - DLC
    Agency Arms Urban Combat Stripped Slide For Glock 17 Gen 4 - DLC
    $950.00
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  12. Gun Pro Delta 1 Sight Set - FN 509
    Gun Pro Delta 1 Sight Set - FN 509
    $84.00
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  13. Battle Arms Development ONE:1 416R Threaded Barrel For Glock 19 - Black Nitride
    Battle Arms Development ONE:1 416R Threaded Barrel For Glock 19 - Black Nitride
    $199.00
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  14. Lantac Ti-PIN Titanium Frame Pins For Glock Gen 1-4
    Lantac Ti-PIN Titanium Frame Pins For Glock Gen 1-4
    $35.99
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  15. Battle Arms Development ONE:1 4140 Barrel For Glock 19 - Black Nitride
    Battle Arms Development ONE:1 4140 Barrel For Glock 19 - Black Nitride
    $185.99
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  16. Brügger & Thomet (B&T) Universal Service Weapon USW for Sig Sauer P320
    Brügger & Thomet (B&T) Universal Service Weapon USW for Sig Sauer P320
    $299.00
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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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  36. Glock 48 8 items
  37. H&K VP9 1 item
  38. Nomad 9 3 items
  39. Sig P220 1 item
  40. Sig P226 1 item
  41. Sig P229 1 item
  42. Sig P238 1 item
  43. Sig P320 48 items
  44. Sig P365 18 items
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  54. Stoeger STR-9 1 item
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  1. $0.00 - $999.99 230 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 4 items
  11. Holster 1 item
  12. Iron Sight 1 item
  13. Locking Block 1 item
  14. Magazine 4 items
  15. Magazine Extension 3 items
  16. Magazine Release 6 items
  17. Magwell 17 items
  18. Muzzle Device Accessory 2 items
  19. Optic Plate 1 item
  20. Parts Kit 2 items
  21. Pistol Accessory 1 item
  22. Pistol Frame 9 items
  23. Pistol Part 15 items
  24. Pistol Sights 9 items
  25. Recoil Spring 4 items
  26. Safety Selector 1 item
  27. Slide 45 items
  28. Slide Parts Kit 4 items
  29. Spring 1 item
  30. Top Cover 1 item
  31. Trigger 22 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
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  1. 1:10 6 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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