8.6 is BLK is the 300BLK big brother. 300BLK is designed for AR15 and 8.6BLK is designed for AR-10.
For 300BLK all you have to do is switch you barrell it’s the same for 8.6BLK, and it uses a .308 bolt ,308 mags.
The other big thing that 8.6 BLK does is it uses a fast twist barrel which is a 1 & 3 which takes a little bit of the energy from the sound and flash then converts it to energy on target.
Subsonic is terminal performance at 450-600 meters.
The energy on target out of a 12 inch barrel at 600 meters is the same as a .45ACP at the muzzle.
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