Americo, there is a four-position regulator for the gas system that should allow firing light loads to heavy loads. Read about it in the owners manual, pages 10-11 here >>>>>> jtsgroup.us/manual/m12ak-t1ownersmanual.pdf

Americo, this is very likely a situation of users not matching the adjustable gas system to the loads they are firing. Details here : youtube.com/watch?v=yfH-8wNnsug

I've not shot one, but have heard that the 2¾" shells seem to cycle much better then 3" shells, and that higher velocity rounds (1200fps or better) seem to also run much better then the slower stuff.
But id probably still go with a Mossber, Berreta, Benneli, RIA something a bit more proven and supported