I usually see worksmanship like that on cheapo Belgian or Spanish guns. That thing looks pretty crude to me. I would not shoot it either.
Let me present a quote from very well respected expert (seen references about his work on the other side of the Atlantic):
"Many US shooters are playing self-styled proof-house experts by deciding that their foreign-mde guns can withstand 'X' level of chamber pressure."
Many seem to put faith in Euro C.I.P. 65mm shells some of which can generate above 60MPa of gas pressure.