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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.

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  2. Killer Innovations CZ P10-C Non-Threaded Velocity Barrel
    Killer Innovations CZ P10-C Non-Threaded Velocity Barrel
    $249.00
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  3. True Precision Sig Sauer P365XL X-Fluted Match Grade Barrel
    True Precision Sig Sauer P365XL X-Fluted Match Grade Barrel
    $161.49 - $180.49
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  4. Rainier Arms MARS Ambi Glock Mag Release: Gen 4 & 5
    Rainier Arms MARS Ambi Glock Mag Release: Gen 4 & 5
    $59.95
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  14. Ribbons Free Good Killer Innovations Velocity MOD1 Stripped Slide For Glock 17 - Gen 3
    Killer Innovations Velocity MOD1 Stripped Slide For Glock 17 - Gen 3
    $459.00
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  15. Apex Tactical Specialties Action Enhancement Trigger Kit for Glock 43/43X/48
    Apex Tactical Specialties Action Enhancement Trigger Kit for Glock 43/43X/48
    $128.25 - $133.00
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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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  8. $800.00 - $899.99 5 items
  9. $900.00 and above 4 items
Product Type
  1. Accessory 8 items
  2. Adapter Plate 1 item
  3. BackPack 1 item
  4. Backplate 2 items
  5. Barrel 115 items
  6. Basepad 13 items
  7. Bipod Mount 1 item
  8. Bolt Catch 1 item
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  10. Compensator 51 items
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  16. Flashlight Accessory 1 item
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  27. Locking Block 3 items
  28. Magazine 8 items
  29. Magazine Accessory 2 items
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  32. Magazine Release 21 items
  33. Magwell 51 items
  34. Muzzle Device Accessory 2 items
  35. Optic Plate 6 items
  36. Parts Kit 9 items
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  38. Pistol Frame 37 items
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  40. Pistol Part 51 items
  41. Pistol Sights 18 items
  42. Rear Sight 1 item
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  44. Safety Selector 2 items
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  46. Sled Feet 1 item
  47. Slide 117 items
  48. Slide Parts Kit 8 items
  49. Slide Plate 7 items
  50. Spring 7 items
  51. Stabilizer Kit 4 items
  52. Take Down / Pivot Pins 1 item
  53. Thumb Rest 1 item
  54. Top Cover 1 item
  55. Trigger 85 items
  56. Trigger / Hammer Pins 1 item
  57. Upper Parts Kit 2 items
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  11. Carry 1 item
  12. Full 5 items
Thread Pitch
  1. 1/2x28 60 items
  2. M13.5x1 LH 1 item
Threaded
  1. Yes 16 items
  2. No 27 items
Twist Rate
  1. 1:9 1 item
  2. 1:10 57 items
  3. 1:16 3 items
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  1. In stock 664 items
  2. Out of stock 219 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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