Ok GURPS calculates damage based on barrel length, diameter and mass of the bullet. The ak101 is an ak that uses the same rounds as an M4/m16.
In GURPS high tech ak101's 410mm barrel deals a little less damage than the m16 508mm and more than the m4's 370mm barrel. At least 5d-1 (average of 16.5), vs 17.5 of m16 or 16 of the m4. Just a .5 better damage.
Anyway it seems that GURPS is not using joules or kinetic energy for damage so I hope I can claim this and make it open - meaning anyone can use joules * area of impact/effect * mechanical efficiency as an open method of calculating damage.
By this method an ak47 does more damage at 2100 joules. I don't know where that bias is coming from, although I've never touched a real ak I can from thinking about it see how 2100 joules will screw you with recoil.
Waiting for my dad to get back from south Africa so he can transfer his gun to me, so I can learn to shoot real steel. Mulling the grey area of Philippine gun ownership, regarding assault weapons - sigh- some weapons are cheaper than the airsoft version.