I had the same problem with my sentry. Check to see if the mag is tight when seated, if you can push the mag up slightly when seated you may benefit from the EGW high mag catch.
You can test this by seating a full may and then put the gun down on the counter so it pushes up the mag, and then rack the slide to see if it feeds. if it does the EGW will help
I put the EGW in mine and it feeds everything.