I am thinking about buying a HK53 that was built on a HK93. Here are my questions - is there a way to tell if the conversion was done using a factory HK53 front end, versus a conversion where the HK93 cocking tube has been cut-up and welded? Also, are there other "HK53 specific" parts that I should look for on this conversion? I am ultimately looking for the closest thing to a factory HK53 that I can legally own (this is a sear gun). Thanks in advance for sharing your knowledge.