Can anyone advise me on the right Blackhawk IWB holster to use. Nylon, not leather or serpa. I had been using the Blackhawk size 6, but after only about a month of infrequent use, the front sight snagged on the inside of the holster as I was removing my XDM9. I am just grateful that this was not an emergency situation, because the snag slowed me down considerably & could have been fatal. I am open to suggestions on similar holsters if no Blackhawk would work properly.