black stainless steel automatic selector switches auto-semi sear for glocks 17/19

this product consists of three parts.even if you only buy one part, we can disassemble and transport it, and you can replace the damaged parts. we specially updated the design and manufacture of the tail of the pin, and the larger tail can effectively prevent slipping.automatic switch selctor can meet 9mm and.40 cal. push the pin left and right to quickly and flexibly switch to full-automatic and semi-automatic functions.it can be used directly without any modification.it can meet several gen..syi