338 ARC AR15 Barrel- 8.5", 416 R Stainless

338 ARC AR15 Barrel- 8.5", 416 R Stainless

SKU:
138-0301-001
$244.95
(2 reviews)
Current Stock:
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Description

• Chamber- 338 ARC, compatible with type II 6.5G bolt face

• Length- 8.5"

• Gas system- Pistol Length

• Gas Block Size- .750

• Threads- 5/8-24

• Finish- Bead blasted matte grey

• Twist- 1:8

• Material-416R Stainless

• Extension-M4

• Marked for Caliber and Twist

• Weight- 18.7 oz

• Barrel is Dimpled for Gas Block Set Screw

• Fully Made In House From KAK Industry Produced Blanks

 

KAK recommends 400 legend mags for these barrels to function best with the 307 subsonic ammunition bullet profile

 

Velocity Data with OUR Barrels Using Factory Hornady supers and subs

Note- This data is on brand new barrels, you can expect velocities to increase once they break in

            175 gr supersonic      307 gr Subsonic

16"       2075 FPS                   1030 FPS

10.5"    1940 FPS                   1014 FPS

8.5"      1850 FPS                   1003 FPS

Note- We gas our barrels to run subsonic ammunition with a suppressor, a suppressor is required for full functionality when shooting subsonic rounds.

Additional Information
Caliber:
338 ARC
Finish:
Stainless
Length:
8.5"

Reviews

  • 5
    Quality

    Posted by Hart Johnson on March 17, 2025

    I’m happy with my purchase and understand the 338 ARC a lot better now that’s it’s in my hand. Fitment, finish and machining was excellent. This barrel cycled and shot to point of aim at about 1 moa or better freehand. It is ported for subs but runs supersonic as well. An adjustable gas block is highly recommended. I was not shooting suppressed and so my handloads required use of my lightweight Bolt Carrier and it then function fine with both the 220 Grain Speer Hot-Cor and the 300grn SMK, same charge of Shooters World Blk. I went ahead and got KAK’s 7.5” handguard and their 5” flash can to put that concussion further out and direct it and the sound away. This by far is the softest shooter I own of any black rifle cartridge. I can imagine suppressed would be awful quiet about is a soft shooter. For its intended purpose and design the 338 ARC is gonna be hard to beat in the short, suppressed, subsonic genre which is its primary role. What’s not to like about a 300grn high bc bullet rolling along subsonic, using 12 grains of powder, quiet as a mouse acoustically and mechanically. It’s a soft shooter in this form for sure. Looking forward to future developments and trying additional loadings. Great work KAK!!!

  • 5
    338 Arc 8.5" = Wow

    Posted by Travis on February 11, 2025

    I’ve been using the new 338 Arc 8.5” KAK barrel on my AR, and it’s a suppressed hunting game changer. I'm super impressed for such a compact barrel. The build quality is solid, and it fits perfectly in my setup. Highly recommend for anyone looking to boost performance without compromising on size and it's just a plain dream to shoot.