This laser sight requires an accessory rail.
Make sure your gun has an accessory rail before purchase.
Some early generation of Glock handguns don't have an accessory rail.
This green laser light combo can only be mounted on Glocks with
accessory rail. You are welcome to contact us
if you have any question.
Heckler & Koch
Some early generation of Heckler & Koch H&K USP model requires
an adapter. These models have their own proprietary rails that are
different from standard accessory rails. Fortunately, adapters can solve
this problem. You are welcome to contact us
if you need one.