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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. 3.1" 4 items
  2. 3.54" 1 item
  3. 3.6" 3 items
  4. 3.7" 1 item
  5. 3.86" 1 item
  6. 3.9" 9 items
  7. 4.1" 1 item
  8. 4.25" 2 items
  9. 4.3" 2 items
  10. 4.57" 1 item
  11. 5" 1 item
Barrel Profile
  1. SDM 1 item
Caliber
  1. 9mm 47 items
Category
  1. Pistol parts 278 items
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Configuration
  1. Curved 1 item
  2. Flat 1 item
  3. Right Hand 1 item
  4. Standard 1 item
  5. Straight 1 item
  6. P320 9 items
  7. P365 5 items
  8. P365XL 2 items
  9. Handgun 2 items
Finish
  1. Black/Black 2 items
  2. Black DLC 1 item
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  5. DLC 17 items
  6. MDC (Gray) 1 item
  7. Nitride 8 items
  8. Anodize 1 item
  9. PVD/CVD 3 items
  10. Quench Polish Quench (QPQ) 1 item
  11. Titanium Nitride (TiN) 9 items
  12. Molecular Dense Coating (MDC) 3 items
Magazine Capacity
  1. 6rd 1 item
  2. 7rd 1 item
Manufacturer
  1. Agency Arms 15 items
  2. Align Tactical 5 items
  3. Apex Tactical Specialties 6 items
  4. ARC Division 1 item
  5. Brügger & Thomet (B&T) 1 item
  6. CAA 1 item
  7. Danger Close Armament 12 items
  8. DPM Systems Technologies 18 items
  9. Empire 6 items
  10. Faxon Firearms 8 items
  11. GoGun USA 3 items
  12. Grayguns 26 items
  13. Grey Ghost Precision 1 item
  14. Griffin Armament 2 items
  15. Killer Innovations 13 items
  16. L2D Combat 2 items
  17. Midwest Industries 1 item
  18. Mirzon 3 items
  19. Mischief Machine 10 items
  20. NIGHT FISION 4 items
  21. Norsso 12 items
  22. Obsidian Arms 2 items
  23. Radian Weapons 1 item
  24. Rainier Arms, LLC 2 items
  25. Shalotek 35 items
  26. Sharps Bros 3 items
  27. Sig Mechanics 2 items
  28. Sig Sauer 40 items
  29. Springer Precision 3 items
  30. Strike Industries 2 items
  31. Tactical Development 5 items
  32. The Gun Co. 1 item
  33. True Precision 15 items
  34. Tyrant Designs 17 items
  35. Wilson Combat 1 item
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  1. Glock 19 2 items
  2. Glock 23 1 item
  3. Sig P22X 4 items
  4. Sig P220 9 items
  5. Sig P226 10 items
  6. Sig P228 4 items
  7. Sig P229 6 items
  8. Sig P238 3 items
  9. Sig P320 143 items
  10. Sig P365 59 items
  11. Sig P365-FUSE 2 items
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  13. Sig P365XL 38 items
  14. Sig P365 X-Macro 4 items
  15. Sig P938 3 items
  16. Sig MPX 1 item
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  2. Trijicon RMR 2 items
Option
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  2. Glock 2 items
  3. Sig Sauer 74 items
  4. Left-Hand 2 items
Price
  1. $0.00 - $999.99 278 items
  2. $1,000.00 and above 1 item
Product Type
  1. Accessory 4 items
  2. BackPack 1 item
  3. Backplate 1 item
  4. Barrel 1 item
  5. Basepad 4 items
  6. Compensator 8 items
  7. Extended Slide Stop 2 items
  8. Failure Resistant Extractor 1 item
  9. Fire Control Unit 2 items
  10. Grip Module 36 items
  11. Guide Rod 13 items
  12. Handguard 1 item
  13. Handgun Barrel 42 items
  14. Handgun Sights 4 items
  15. Laser 1 item
  16. Magazine 2 items
  17. Magazine Extension 1 item
  18. Magazine Release 10 items
  19. Magwell 12 items
  20. Muzzle Device Accessory 1 item
  21. Optic Plate 1 item
  22. Parts Kit 2 items
  23. Pistol Accessory 3 items
  24. Pistol Frame 24 items
  25. Pistol Grip 1 item
  26. Pistol Part 10 items
  27. Pistol Sights 3 items
  28. Recoil Spring 18 items
  29. Sled Feet 1 item
  30. Slide 51 items
  31. Slide Parts Kit 2 items
  32. Spring 1 item
  33. Stabilizer Kit 1 item
  34. Take Down / Pivot Pins 1 item
  35. Trigger 20 items
Size
  1. Small 1 item
  2. Medium 1 item
  3. Large 2 items
  4. Micro-Compact 1 item
  5. X-Compact 5 items
  6. Sub-Compact 1 item
  7. Compact 5 items
  8. Carry 1 item
  9. Full 4 items
Thread Pitch
  1. 1/2x28 (9mm) 23 items
Threaded
  1. Yes 2 items
  2. No 10 items
Twist Rate
  1. 1:10 27 items
Stock Status
  1. In stock 184 items
  2. Out of stock 95 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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