IDPA blog posted
statistics from 2012 Carolina cup. Glocks and S&W were the most used guns with Glock at $35.7%, S&W at 34.9%. Striker-fired pistols accounted for 62.7%
In a separate question, 31.8% said they primarily carry Glocks for CCW, 23.6% S&W.
Paul Erhardt has an interesting
analysis of this phenomenon. He credits GSSF program for making coverts out of a lot of 1911 users.
From: IDPA blog, Shootingwire