To See Our Holiday 2024 Schedule, Please Visit Our Contact Page.

Pursue Your Passion
My Cart

Rainier Arms on Instagram

Menu
Account

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.

Parts
We can't find products matching the selection.

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.

Shop By
Now Shopping by
  1. Caliber 9mm Remove This Item
  2. Price $0.00 - $999.99 Remove This Item
Clear All
Shopping Options
Barrel Length
  1. 3.1" 3 items
  2. 3.25" 1 item
  3. 3.5" 1 item
  4. 3.54" 1 item
  5. 3.6" 2 items
  6. 3.66" 1 item
  7. 3.7" 3 items
  8. 3.86" 1 item
  9. 3.9" 8 items
  10. 4.02" 2 items
  11. 4.25" 2 items
  12. 4.3" 2 items
  13. 4.37" 1 item
  14. 4.4" 1 item
  15. 4.46" 1 item
  16. 4.5" 1 item
  17. 4.57" 1 item
Color
Configuration
  1. Gen 3 6 items
  2. Gen 4 4 items
  3. GEN 4/5 1 item
  4. Gen 5 5 items
  5. G17 4 items
  6. G19 4 items
  7. G26 2 items
  8. G43 4 items
  9. P320 1 item
  10. P365XL 1 item
  11. Handgun 3 items
Finish
  1. Black 3 items
  2. Black/Black 1 item
  3. Black/TiN 1 item
  4. Chameleon 1 item
  5. DLC 26 items
  6. Gold 1 item
  7. Gray 2 items
  8. Nitride 3 items
  9. Titanium Nitride 1 item
  10. PVD/CVD 3 items
  11. Titanium Nitride (TiN) 25 items
  12. Molecular Dense Coating (MDC) 13 items
Magazine Capacity
  1. 8rd 2 items
  2. 10rd 1 item
Manufacturer
  1. Agency Arms 19 items
  2. Arms Republic 4 items
  3. Battle Arms Development 1 item
  4. Danger Close Armament 2 items
  5. Faction 1 item
  6. Faxon Firearms 16 items
  7. Fortis MFG 2 items
  8. Forward Controls Design 2 items
  9. Grey Ghost Precision 3 items
  10. Griffin Armament 5 items
  11. HB Industries 1 item
  12. Killer Innovations 21 items
  13. L2D Combat 2 items
  14. Lantac 3 items
  15. Lone Wolf Arms 2 items
  16. Nighthawk Custom 3 items
  17. Nomad Defense 3 items
  18. Norsso 4 items
  19. Noveske 3 items
  20. Radian Weapons 2 items
  21. SCT Manufacturing 2 items
  22. Shalotek 2 items
  23. Sharps Bros 1 item
  24. Spinta Precision 1 item
  25. Strike Industries 2 items
  26. Trinity Nevada 3 items
  27. True Precision 27 items
  28. Tyrant Designs 3 items
  29. Zaffiri Precision 2 items
Model
  1. CZ P-10 3 items
  2. Glock 17 25 items
  3. Glock 19 41 items
  4. Glock 19X 3 items
  5. Glock 23 1 item
  6. Glock 26 5 items
  7. Glock 34 4 items
  8. Glock 43 9 items
  9. Glock 43X 1 item
  10. Glock 45 3 items
  11. Glock 47 1 item
  12. Glock 48 4 items
  13. Glock 49 1 item
  14. Sig P320 21 items
  15. Sig P365 10 items
  16. Sig P365-FUSE 2 items
  17. Sig P365X 2 items
  18. Sig P365XL 8 items
  19. Sig P365 X-Macro 2 items
  20. S&W M&P Shield 2 items
  21. Springfield Hellcat 4 items
  22. Springfield Hellcat Pro 2 items
Optic Footprint
  1. Trijicon RMR 1 item
Option
  1. CZ 2 items
  2. Glock 39 items
  3. Sig Sauer 5 items
  4. Smith & Wesson 2 items
Platform
  1. 1911 3 items
  2. CZ 3 items
  3. Glock 78 items
  4. Sig Sauer 37 items
  5. Smith & Wesson 2 items
  6. Springfield 6 items
Product Type
  1. BackPack 1 item
  2. Barrel 2 items
  3. Compensator 12 items
  4. Handguard 1 item
  5. Handgun Barrel 103 items
  6. Magazine 3 items
  7. Pistol Frame 3 items
  8. Slide 16 items
  9. Trigger 1 item
Size
  1. Compact 2 items
Thread Pitch
  1. 1/2x28 (9mm) 63 items
Threaded
  1. Yes 10 items
  2. No 14 items
Twist Rate
  1. 1:10 74 items
  2. 1:16 3 items
Stock Status
  1. In stock 141 items Remove This Item
My Wish List
Last Added Items
  1. Add to Cart
    Remove This Item
Go to Wish List
You have no items in your wish list.

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.

Google Customer Reviews Google Customer Reviews