The Thumb Snap System is being used on a UM84I 14531 with a Colt 1911 Government.
Snap is snug and to the inside, preventing quick access, however, it effectively contains the 1911 in a condition one configuration, cocked and locked, with the hammer back and thumb safety on. The snap releases quickly after you get to it.
Pros: snug
Cons: snug
This review was written in the old system and had content requirements that are different than reviews written today.