retention

I'm having some trouble finding an OWB holster with retention for my M11-A1. There were a number of options at my local shop, both leather and kydex, both thumb break and Serpa, but I couldn't fit my M11-A1 into any of the ones that said they were for the P229. The slide was too wide. Any idea...

PLEASE HELP- Will someone help me finally understand "Holster Retention Levels"? Ever had one of those topics where you just KNOW you're going to get blazed for your ignorance, but there's no other real way to learn but to go through the fire? Because even though I've been handgunning and...