Nope. Not at all. Drill Sgts didn't mind. The rounds have really no place to move and when you hit the mag from the top it really creates no problem. Plus when you look at the feeding chamber you see that when receiver slides back there is no way that jam can get created due to construction of the loading mechanism. I do the same things now on my Ruger and the only jams I have is not from improper feed but from ejector mechanism. <br><br>The only way you can have a jam is when empty shell wasn't ejected from the chamber and new one was loaded in. It happened to me couple of times during Field Excercise when we were shooting blanks all day and than live rounds without cleaning of the rifle.