I got a new sr9 about a week ago and had put about 100 rounds through it with no problems. took it out today and on the 1st shot of the 3rd magazine I'd put through it I had a fte. the empty shell was jammed by the slide and the takedown pin was slightly out. since this was the first shot I thought maybe i had somehow pushed the pin out while putting the magazine in. then on the next mag it did again this time on the 3rd shot though. has anyone else had this problem or maybe im doing something without realizing. any help would be appreciated.