Have not seen the fourth pic down - nice, thanks for posting these.
It would certainly have been a loud report shooting close to that stone wall - !
You can really see the chemical-blue "tide-mark" mid way down the magazine (not in the rifle) - this is encountered on many FG42 magazines, mine included.
Also appears that one off the mags is phosphate finished, I have seen these, do not own one.
A rumor from an old time collector in Europe was that two were issued with each gun marked, Sjl01 and sjl02 - this I find difficult to believe.
I have seen several sjl01 (mine is one) and only one sjl02 marked mag (Bapty & Co).
Fascinating pictures of the two "curved-barrel" attachments, apparently the bullet broke to pieces and came out in fragments, very ineffectively, I don't know I have only read this. The lesser curved one being the more effective.
wish we could see the serial # on that FG - !