Blade-Tech makes both the
DOH (dropped offset holster) and the
UCH (ultimate concealment holster) to fit the STI GP6 specifically . The
DOH is an excellent range holster that is ideal for IPSC production division. As mentioned, the dropped offset spacer can be removed (and replaced) easily in just a matter of minutes, and makes the holster legal and ideal for IDPA. The
UCH is an inside-the-waistband holster that is ideal for CCW and legal for IDPA.
If you want a Blade-Tech holster for your GP6, buy one made expressly for the GP6. You can get it directly from Blade-Tech or from a Canadian stocking dealer like
http://www.doubletapsports.com/. The Blade-Tech for the M&P will fit, but not as well as does the holster for the GP6.
DOH
http://www.blade-tech.com/DOH-Dropped-Offset-Holster-w-Tek-Lok-pr-1167.html
Ultimate Concealment Holster
http://www.blade-tech.com/Blade-Tech-Ultimate-Concealment-Holster-pr-821.html