DO NOT USE  bullets that are larger than .277" in these barrels, the chambers were designed for .277" bullets and all 6.8 barrels have a .277" bore so bullets larger than .277 will cause excess pressure and increased copper fouling.  It seems some Maker bullets and Cavity Back bullets made by Maker are .278" and on top of that they are solid copper so check the diameter of the bullets before using them.

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 AR Performance (ARP)

Morristown Tennessee 37814

Hi performance 5.56 & 6.8 SPC barrels and parts since 2007

The best way to contact is by email
Email:  tech@AR15performance.com

Phone: 801-750-4216  8am-5pm eastern time  M- Fri only
Sorry we do not export anything and do not have a storefront. Everything must be purchased online.