There are many 'experts' on the Internet but the only way to get an idea or in the case of paying money, a written analysis is to consult a degreed Metallurgical Engineer with experience in failure analysis. I used to do a few of them in Graduate School under the direction of my Professor after which he issued a signed document but of course the analysis and physical examination which often consisted of slicing of the material, polishing and examination under a high mag scope costs money, so if you contact a local University you just might find a bored Metallurgist that will give you an opinion for free but you must supply the part in question and be careful about bringing a firearm part on University property these days.-Dick
BTW I consider Hugh Lomas very knowledgeable from my limited conversations with him in the past and his initial Post offers good informtation.
Things do fail if not correctly manufactured and tested. that is why we have Proof Testing and other standards bodies such as ASME and the like but I am not certain under which standards Turkish manufactured firearms fall into, i would guess the Proof Laws of that country.
Low cost should not be a criteria for judgment or as a reason for failure or whether a firearm is safe or not.
