Pursue Your Passion
My Cart

Discord

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

Dark mode is

View as Grid List

Items 1-16 of 71

Page
per page
  1. 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
    Out of stock
    Add to Wish List Add to Compare
  2. Agency Arms Sig P320 X Series Magwell - Black
    Agency Arms Sig P320 X Series Magwell - Black
    $100.00
    Out of stock
    Add to Wish List Add to Compare
  3. Agency Arms Sig P320 Compact/X-Carry Gavel Slide - DLC
    Agency Arms Sig P320 Compact/X-Carry Gavel Slide - DLC
    $825.00
    Out of stock
    Add to Wish List Add to Compare
  4. Agency Arms Sig P320 Single Port Compensator - Black
    Agency Arms Sig P320 Single Port Compensator - Black
    $108.00
    Out of stock
    Add to Wish List Add to Compare
  5. Agency Arms Sig P320 Compact/X-Carry Syndicate S2 Slide
    Agency Arms Sig P320 Compact/X-Carry Syndicate S2 Slide
    $575.00
    Out of stock
    Add to Wish List Add to Compare
  6. Agency Arms Sig P320 Dual Port Compensator - Black
    Agency Arms Sig P320 Dual Port Compensator - Black
    $100.00
    Out of stock
    Add to Wish List Add to Compare
  7. Agency Arms Sig P320 Compact/X-Carry Syndicate S1 Field Slide - DLC
    Agency Arms Sig P320 Compact/X-Carry Syndicate S1 Field Slide - DLC
    $575.00
    Out of stock
    Add to Wish List Add to Compare
  8. Agency Arms Sig P320 Compact/X-Carry Syndicate S1 Urban AOS Slide
    Agency Arms Sig P320 Compact/X-Carry Syndicate S1 Urban AOS Slide
    $575.00
    Out of stock
    Add to Wish List Add to Compare
  9. Agency Arms AOS Sig P320 ACRO Optic Plate (Includes Sights)
    Agency Arms AOS Sig P320 ACRO Optic Plate (Includes Sights)
    $145.00
    Out of stock
    Add to Wish List Add to Compare
  10. Agency Arms Icarus Sig P320 X-Carry Grip Module - Black
    Agency Arms Icarus Sig P320 X-Carry Grip Module - Black
    $520.00
    Out of stock
    Add to Wish List Add to Compare
  11. Agency Arms Sig P320 Compact Premier Line Threaded Barrel - SS
    Agency Arms Sig P320 Compact Premier Line Threaded Barrel - SS
    $310.00
    Out of stock
    Add to Wish List Add to Compare
  12. Apex Tactical Specialties Sig P320 Advanced Flat Trigger
    Apex Tactical Specialties Sig P320 Advanced Flat Trigger
    $61.75
    Out of stock
    Add to Wish List Add to Compare
  13. Apex Tactical Specialties Sig P320 Forward Set Trigger Kit - Flat
    Apex Tactical Specialties Sig P320 Forward Set Trigger Kit - Flat
    $133.00
    Out of stock
    Add to Wish List Add to Compare
  14. Apex Tactical Specialties Sig P320 Forward Set Trigger Kit - Curved
    Apex Tactical Specialties Sig P320 Forward Set Trigger Kit - Curved
    $133.00
    Out of stock
    Add to Wish List Add to Compare
  15. Apex Tactical Specialties Sig P320 Forward Set Trigger Bar Kit
    Apex Tactical Specialties Sig P320 Forward Set Trigger Bar Kit
    $85.50
    Out of stock
    Add to Wish List Add to Compare
  16. Rainier Arms Exclusive Danger Close Armament DCA-320 Select Match 9mm Barrel For Sig P320 - (3.9")
    Danger Close Armament DCA-320 Select Match 9mm Barrel For Sig P320 - (3.9")
    Out of stock
    Add to Wish List Add to Compare
View as Grid List

Items 1-16 of 71

Page
per page

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. Platform Sig Sauer Remove This Item
  2. Price $0.00 - $999.99 Remove This Item
Clear All
Shopping Options
Barrel Length
  1. 3.6" 1 item
  2. 3.9" 2 items
  3. 4.1" 1 item
  4. 5" 1 item
Caliber
  1. 9mm 8 items
Category
  1. Pistol parts 70 items
Color
Configuration
  1. Curved 1 item
  2. Flat 1 item
  3. Straight 1 item
  4. P320 3 items
  5. P365 2 items
  6. Handgun 1 item
Finish
  1. Black DLC 1 item
  2. DLC 8 items
  3. Nitride 1 item
  4. Titanium Nitride (TiN) 3 items
  5. Molecular Dense Coating (MDC) 1 item
Is Firearms?
  1. No 71 items
Magazine Capacity
  1. 7rd 1 item
Manufacturer
  1. Agency Arms 10 items
  2. Apex Tactical Specialties 4 items
  3. Brügger & Thomet (B&T) 1 item
  4. Danger Close Armament 4 items
  5. DPM Systems Technologies 1 item
  6. Empire 4 items
  7. Grayguns 5 items
  8. Killer Innovations 1 item
  9. L2D Combat 1 item
  10. Midwest Industries 1 item
  11. Mischief Machine 8 items
  12. NIGHT FISION 1 item
  13. Norsso 4 items
  14. Shalotek 6 items
  15. Sharps Bros 1 item
  16. Sig Mechanics 1 item
  17. Sig Sauer 8 items
  18. Springer Precision 2 items
  19. Tactical Development 3 items
  20. Tyrant Designs 3 items
  21. Wilson Combat 1 item
Model
  1. Sig P22X 1 item
  2. Sig P220 2 items
  3. Sig P226 2 items
  4. Sig P228 1 item
  5. Sig P229 2 items
  6. Sig P238 2 items
  7. Sig P320 44 items
  8. Sig P365 13 items
  9. Sig P365X 2 items
  10. Sig P365XL 7 items
  11. Sig P938 1 item
  12. Sig MPX 1 item
Mount
  1. Picatinny 1 item
Optic Footprint
  1. Shield RMSc 1 item
Option
  1. Sig Sauer 24 items
Price
  1. $0.00 - $99.99 25 items
  2. $100.00 - $199.99 13 items
  3. $200.00 - $299.99 10 items
  4. $300.00 - $399.99 8 items
  5. $400.00 - $499.99 10 items
  6. $500.00 - $599.99 4 items
  7. $800.00 and above 1 item
Product Type
  1. Accessory 2 items
  2. Barrel 5 items
  3. Basepad 1 item
  4. Compensator 3 items
  5. Grip Module 7 items
  6. Handgun Barrel 2 items
  7. Handgun Sights 1 item
  8. Magazine 1 item
  9. Magazine Extension 1 item
  10. Magazine Release 2 items
  11. Magwell 3 items
  12. Muzzle Device Accessory 1 item
  13. Optic Plate 1 item
  14. Parts Kit 1 item
  15. Pistol Frame 13 items
  16. Pistol Part 2 items
  17. Pistol Sights 1 item
  18. Recoil Spring 1 item
  19. Sled Feet 1 item
  20. Slide 16 items
  21. Trigger 7 items
Size
  1. Medium 1 item
  2. X-Compact 3 items
  3. Compact 2 items
  4. Full 1 item
Thread Pitch
  1. 1/2x28 4 items
Threaded
  1. Yes 1 item
  2. No 3 items
Twist Rate
  1. 1:10 5 items
Stock Status
  1. Out of stock 71 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