iet i ▁Category : Ital ian ▁ess ay ists ▁Category : Ital ian ▁po ets ▁Category : Ital ian ▁literary ▁critics ▁Category : 2 0 th - century ▁Italian ▁non - f iction ▁writers ▁Category : 2 0 th - century ▁Italian ▁male ▁writers ▁Category : V iare gg io ▁Prize ▁w inners ▁Category : Ital ian ▁male ▁non - f iction ▁writers ▁Category : 2 0 th - century ▁ess ay ists <0x0A> </s> ▁In ▁fire ar ms ▁operating ▁systems , ▁the ▁term ▁roll er ▁locked ▁refers ▁to ▁lock ing ▁the ▁b olt ▁with ▁roll ers . ▁Notable ▁examples ▁of ▁fire ar ms ▁using ▁this ▁method ▁are ▁the ▁M G ▁ 4 2 ▁and ▁Rhein met all ▁M G ▁ 3 ▁general - pur pose ▁machine ▁guns , ▁and ▁the ▁C Z ▁ 5 2 ▁semi - autom atic ▁p istol . ▁ ▁Rol ler - delay ed ▁blow back ▁ ▁as ▁in ▁the ▁H K ▁G 3 , ▁where ▁similar ▁roll ers ▁are ▁used ▁is ▁sometimes ▁mistaken ly ▁called ▁roll er ▁locked , ▁but ▁there ▁is ▁no ▁genu ine ▁lock ing ▁of ▁the ▁b olt ▁and ▁no ▁re co iling ▁of ▁the ▁bar rel ▁in ▁delayed ▁blow back ▁action . ▁ ▁Other ▁systems ▁with ▁many ▁similar ities ▁to ▁the ▁roll er ▁locked ▁system ▁includes ▁the ▁ball ▁bearing ▁roll er ▁lock ing ▁system ▁used ▁in ▁An sch üt z ▁ 1 8 2 7 ▁Fort ner ▁and ▁He ym ▁SR ▁ 3 0 ▁and ▁the ▁radial ▁lock ing ▁system ▁used ▁in ▁the