JerryDGeek - your post made me think when you mentioned recoil. The Glock's polymer frame absorbs some of the recoil and is probably cushioning the blow from the full house .45 round.
Just goes to show one size does not fit all...
I hope your arrest makes the campus paper. I love reading the police beat section in ours (UCF). This beats the usual DUI and domestic dispute stories they run.