I just picked up a used SR40. It appears to be in like new condition and comes in box with all the factory stuff. The spent casing from the factory says it was made in 2011. The previous owner removed the mag disconnect safety. I've put 3 rounds threw it to test it but haven't had time to get to the range for a full test. Being that the mag safety is out should I expect any issues or does this mod usually work ok? Also anything I should change to make it more reliable?