Perhaps i can help you. Just let me know whats going on ? Did you check the Fuse ? Perhaps a Cutoff Jam, remove the Motor and turn the Gears some rounds, or pull the ARL Back that the Springtention can go away
He Jimmy that depends on your needs. If you dont need a metal receiver the Marui SG552 is in my opinion the way to go. If you want something full metal the G&G SG552 is your choice, the G&G is very well made, these G&G Sig line is really good, you have to change nothing only the Hop Rubber and than you are ready to go. As from the players point of view i whould go with the G&G , install a Gate Titan and a new hop rubber and you will have lots of fun with it ! Its more rugged