Well I have been thinking about this all week so i thought it was time to run this by you guys. My buddy just got a brand new Glock 21 in .45acp. so last weekend I was helping him put some rounds though it. I had never shot the the 21 so I was eager to give it a try, plus i have the XD in .45 so it was nice to get a comparison on the two. I'm not bias on any preticular brand. After putting some rounds though his gun I could help but notice the stinging sensation in the area between my thumb and index finger(grip) , similar to hitting a metal pole with an aluminium baseball bat. Before this outing I was confident on my gun control, but after shooting I am questioning my ability and why I was feeling that pain. I had a good solid two handed grip, so what was causing this?