I don't know much about the MP5 platform other than its an HK product. I do know about the different models and Rules about an SBR and having a $200 tax for registering with the ATF. But i am simply interested in finding out if i would be better off looking for a semi-auto Clone, or a semi-auto Original. Iv'e heard of Bobcat Firearm's Clone but is it reliable? If you have any information I would greatly appreciate it. Thank you! -Danny