No one could have guessed that was the problem without knowing what to look for and even knowing it could even be an issue. If you read back to what I posted you will see I mentioned a couple thing besides the ramp before I even mentioned the ramp. I simply got lucky on my 5Th suggestion and crowed about it, But I was wrong on the first 4. I have been shooting for years, and granted I am seriously out of practice I still remember some of the things to look for. But the point is that I have been a shooter for longer than you have been alive or close enough not to matter. There is a Huge amount to learn about shooting and weapons in general, so don't let someone like me con you into thinking we are "experts" cause that a whole boat load of fecal matter.
IF he will let you then watch what they gunsmith does, read a much about shooting and repair as you can. I had at a minimum a dozen large papers back manuals/book on gun/pistol/rifle repair along with reloading tome's, before I got rid of them for being out of date and no longer into shooting. I wouldn't even put that collection of books up against some of the firearms libraries that some of our members have even today. By any standard you care to set I am a piker at firearms repair, and reloading and I have been doing it off and on for years.
Never sweat the small stuff Sir. Learn what you can and or want to. get to know your personal firarms inside and out. Practice ever change you get. work on strengthening your hands and fingers (Especially your fingers) and never forget to practice shooting with your off hand allmost as much as your strong hand. and especially learn how to shoot with both eyes open. Do just hat and you will be a damn good and an above average shooter.
I started this Forum so we could ALL learn something from each other, not to make folks think they are inadequate or lacking in any way. Every one of us started the same way you are. Taking baby steps to learn how to shoot, asking questions from anyone that will talk to us, and reading everything we could find, and when we had the money practicing at the range.. So just relaxe, you are not going to be a world class shooter or gunsmith over night and none of us that think we are were either despite what we choose to think or remember in our old age. Heck some of us barely even qualify as average shooters by today's standards. So you missed something, so the heck what?! Seriously if that the worse thing you miss while you are a shooter than you are way ahead of the pack.