Glock 17 Series (T.Marui) CNC Hardened Steel Hammer polyamide roller

This polyamide roller fits our Glock 17 series hardened steel hammer only.  It does not fit the original T.Marui hammer.  This roller is made of polyamide because it: 1) is an expendable and sacrificial item; 2) smooths blow-back motion; 3) specially caters aluminium nozzle housing and light weight nozzle housing; 4) avoids wear & damage on nozzle housing and hammer during fast blow-back action; 5) is easy and cheap for replacement. All products are made for airsoft only.  They are not made for real steel firearms.