Ok here is the deal.
Glock Leg is called Glock Leg because of the larger number of incidences occuring with Glocks.
The Glock is mentioned primarily because of the sheer numbers of Glocks, all having the "Trigger" Safety as their only safety. I expect other similar designs will join the Glock Leg Numbers, but Glocks still have the quantity and years to be the major contributor.
The Glock does not have any safety feature other than the leaf in the trigger, and the final cock resistance
Glock Leg occurs from a discharge, the discharge occurs from the trigger being depressed (as designed) while holstering the Glock.
The trigger can be depressed by 1) finger, 2) holster material or 3) other material.
- Most of the respondants have mentioned the finger being in the firing position while holstering. This of course should be the easiest one to avoid.
- I believe there has been adequate discussion of various holster material. Damage, Wear, Thumb Strap or even an internal retention nub, can cause the trigger to be depressed while holstering. I think that modern holsters should address most of the concern.
- Other material could be a shirt, cord, or other related stuff, usually clothing. If you have a chunk of stuff in/near the trigger, you may not be aware of this when holstering. This one could happen if your not looking or feeling to ensure that you are clear.
Other Firearms with additional safetys are less likely to cause Glock Leg because there is usually another safety in play
The 1911 for example, has a grip safety as well as manual safety and just make it less likely for a discharge to occur if the trigger is depressed while holstering.
None of this should discourage you from selecting a Glock, but being aware of factors in Glock Leg can help reduce it's occurance. Remember, any Firearm can discharge when conditions are right. The Glock and other similar designs just make it easier.
I have a Glock. but I carry a 1911.