What safety, mag catch opinion needed

[1] If you go with the re-arsenal required mods then it will be correct with the adjustable sight and stock. 

[2] If you go with the original period supplied parts then you'll be in position to change out the adjustable sight to a flip sight at a later date with minimal investment.  One of the NL has an article for minimizing the appearance of the stake marks. I'm sure there are other "How to's" for changing them out.  

Thinking on these two options, #1 won't linger as an open-ended project.  I think I would finish it up IAW post-war, re-arsenal specifications.

That's my two bits worth.    

The CCNLs are a worthwhile reference, or at least I think so.  The only other reference I have is Reisch's book, although I keep thinking Larry Ruth's would be good.  However some of the NLs have some of Mr. Ruth referenced.  The one lesson I've learned from this forum is that none of the references are perfect and I try to update my Riesch book each time I find a discrepancy.  By the way I ended up with seven 3 ring binders for my NLs.  I had several old ones laying around so they ranged from 1.5" to 3".  I prefer the smaller binders as the thicker ones are harder to thumb through and it makes it easier to have a few NLs opened up at the same time.  Oh yea, unless they changed how they're printing them, then you'll get to do the hole punching.  That in itself is pretty neat though since you'll get a good preview of most of the letters. 

That's great news on the gunsmith and good luck on the barrel!

As for the mag catch, depending on what you read there are 4 to 6 different types. I'm thinking the ones with an M may be the one.