I purchased the Hellcat RDP and this was my first experience with a red dot. I was having some difficulty with the red dot as it would seem to disappear at times or become almost a pin prick. I got a firearms trainer to look at it and it was not working correctly. I sent it back to Springfield Armory and they did replace it. I mounted the new red dot and after at the range the red dot fell off the gun during the third magazine. I thought I had done something wrong so I brought it to a gun smith and he said the problem was the screws they sent were wrong while they did seem to go in they were loose which led to them failing and the red dot coming loose. I explained that to Springfield Armory and they replaced that red dot and sent me a new one with two packages of screws. I brought these over to the gunsmith who immediately checked to see if they were correct and they were not. I notified Springfield Armory about this and told them to check with the gunsmith in case they had questions. Waiting to hear back from them and if the gunsmith can get the right screws to finish mounting the red dot. Anyone else have an issue like this?