Zokulungira za Custom M3 M4 M5 Thumb Knurled, zomwe zimapezeka mu chitsulo chosapanga dzimbiri, mkuwa, ndi aluminiyamu wothira mafuta, zimaphatikiza kusinthasintha komanso zosavuta. Kapangidwe kake kozungulira mutu kamagwirizana ndi malo othira mafuta kuti zikhale zosavuta kumangitsa pamanja—palibe zida zofunika—zabwino kwambiri kuti zisinthidwe mwachangu. Chitsulo chosapanga dzimbiri chimapereka kukana dzimbiri, mkuwa umachita bwino kwambiri pakuwongolera mpweya, ndipo aluminiyamu wothira mafuta umawonjezera kulimba kopepuka ndi kumaliza kokongola. Kukula kwa M3 mpaka M5, zokulungira izi zomwe zingasinthidwe zimagwirizana ndi zamagetsi, makina, ndi mapulojekiti a DIY, kulinganiza kapangidwe kogwira ntchito ndi magwiridwe antchito apadera kuti zigwirizane ndi zomangira zodalirika komanso zosavuta kugwiritsa ntchito.
