For acedemic purposes removing the 2nd. sear would most likely cause the hammer to impact the firing pin whilst the trigger is held down.The firing pin strikes would however be to soft to detonate the primers reliably.The a.t.f. labs use ammunition with soft primers to make conversions like this operate,they then will convict you,even if the gun will operate only with their own doctored ammo.  Do a google search on a device called the ak lightening link it might interest you.