Bought an ASR ; a rifle that used Glock magazines very inpressed, form; function and reliability. Is it perfect no ; but a lot of people will! Steel and aircraft alumni um, m 4 type stock,, simple blow back design.Comes in 9mm,40 s&w, 45acp.Barrel is made to unscrew, collapse stock easily fits into a back pack! Its easy customize to you're preference,picatinney top rail and lower rail to add foregrip and or light !I really enjoy mine! J Calico