Me and my friend stayed up all night (till 3 a.m.) last night doing the pistol grip conversion to my 7.62 saiga, we used a G2 trigger group, a wooden pistol grip, a wooden butt stock, and everything else was original, when we took it out on the range the next morning, the first 2-3 rounds came out on full auto, than it would shoot 1 round at a time, and not cock the hammer back, so i would have to wrack it every time, and than it shot a burst again later on, sometimes it would actually do what it is supposed to do, if i squeezed the trigger fast enough. What did we do wrong? why is it doing th