This drop leg assault holster is fully adjustable to take most semi automatic pistols, including  Glocks, Brownings and Sigs. It's got a thumb break for quick draw. 

Being drop leg it allows easy access even if wearing with webbing or ops vests and even if sat in a vehicle. It can also be adjusted to sit in different positions on the leg to allow for different arm lengths and height.

British DPM

Features:
Adjustable drop-leg fitting with quick-release buckles
2 quick-release leg straps
detachable mag/utility pouch
thumb-break security strap.