hi,just load your first round and keep pulling,it will fire high velocitys and sub sonics without any problems with jamming. FAC needed and only needs to be classed as an .22lr, you also need to have the moderator on the certificate aswell. it has a 28 round blackdog mag and a flash hider for when the moderator is taken off. I looked at all types of semi autos before buying this one, its not a cheap gun but i think reliability is most important. Also its a custom build with the foreend (made in Israel) and ctr stock, has 4 picinary rails for mounting red dots or flash light or a bipod.Seems to