That looks like one of those things that makes me go "Hmm..."
On one hand the idea of a big bullet with lots of powder behind it with a short barrel sounds awesome, but you have a lot of unburnt powder left over (power you could have had with just a little more barrel length)
My question is how much more worse is the kick with the shortened barrel compared to a normal PSL?
Tampering with the gas block placement can mess with timing and beat the fire out of a receiver, especially with a x54R chambering. While I'm sure it still has the "AK reliability" because the gas is runnig at full bore, I'm sure the recoil from it is brutal if it wasnt taken into consideration, or am I wrong in my thinking?
I remember reading reports of that causing some of the issues with the move to the M4's shortened gas system over the rifle length M16s, the same thing happened when DSA shortened their gas systems on the FALs.
I'm already surrounded by half-dead brainless people already, the zombie apocalypse would just give me a reason to be productive and get rid of them.