the one in the pic is a fab defense pistol grip and looks like a ACE? side folding mech. with an m-4 stock. Fab makes their own setup like that with a cleaner looking folding mech and its also available with a recoil reducing buffer tube. Wolverine stocks them. I was looking into butler creek's side folder and a local gunsmith told me that several of his customers had the plastic speed feed ones break right behind the folding mech. and that shells like to fall out of the holders easily. he recomended the steel skeleton model, though I havent tried one myself so I cant comment on it. I will however recommend something with a good rubber recoil pad, the ATI top folder isnt much fun to shoot heavy loads with.