Dovetail will be included with sight purchase. Only buy an extra dovetail if you would like the sight to fit more than one pistol, or replace the dovetail that was sent with your sight. Models of pistols that the dovetails will fit are listed below.
Glock – 17,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,37,38,39,40,41,43,
Sig – P Series
S&W – M&P Series
FN – FNX, FNS
XD – XD,XDM,XDS