possum, the Mak 90 uses a totally different FCG unless ya have swapped it out for a G2 which would be a massive mistake as the Chinese FCG is so much nicer than any of the cast USA junk, the disconector on the Norinco FCG is shorter than any of the Eurpean or USA ones and the hooks are shorter making for a shorter take up with a very crisp release the trigger face itself is also a third wider which makes for a much more comfortable trigger, I have crates full of the Norinco double hook triggers and use em in anything that doesn't get a Red star Arms FCG, I do use the G-2 Hammer and a Century disconector (need a center mount which the Century is and a small hole so no sleeve needed for less free play in the Axis pin) it only takes a few seconds to correct the too tall Century disconector (the cause of trigger slap, from the bolt carrier hitting it) a couple minutes with a hone stone to polish the Disconector hook and the hammer hook shelfs and ya got a glass smooth trigger.........
The TAPCO G-2s quality level fluxuates greatly thats why I won't use em, when I figure in my time to fix them and bring em into spec plus purchase price of FCG itself it comes out to about the same as a red star arms FCG so....... go with the best right from the beginning and be done with it, the customer is extremally happy and I got less time wasted that can go towards another build.....
if your G-2 is showing signs of trigger slap pull the disconecter and profile the top of it (the hook) ya can actually take it down quite a bit without effecting function as its not supposed to contact anything but the hammer, also check to be sure the disconector doesn't have debri or anything else under it causing the spring to be disabled, this can creat trigger slap as well since the springs job is to cusion the disconect as the hammer pushes past the top of the hook...... if its locked up or the spring is to stiff it will cause trigger slap to varying degrees