Wow BBINJ. Sounds like you've seen or done this before.
The question which persists in my mind is that a gas operated weapon must achieve a balance between the gas port location, gas port size and resistence weight of the buffer (or in the AK, bolt carrier). Gas pressure drops quicker in a short barrel weapon, so the port is opened up to allow more gas through. If too much gas gets through, the bolt could unlock before the pressure drops to a safe level, which could lead to the case being unsupported (ka-boom) or case failure/extraction failure. Either that or if there is no ka-boom or case failure, you can also have feeding problems with a shortened action. What size is the gas port on the Krinkov as opposed to the normal lenght AK?
Vigilantibus et non dormientibus jura subveniunt
[This message has been edited by 4V50 Gary (edited November 27, 1999).]