Formerly known as the 3.5 LB connector, this is the GLOCK OEM factory Connector 4.5 LB "minus" (marked "-"). Comes stock on most Glock 17L, Glock 24, Glock 34, Glock 35 models.
It is compatible with all generations and models of GLOCK pistols with the exception of the GLOCK 42 and 43. This WILL NOT work with the GLOCK 42 and 43.
