I believe PTR makes an HK93 clone in 7.62x39. That’s pretty close, in fact, I’ve seen a few of the HK93 knockoffs modified to look a lot like an MP-44.
these guys make a real clone... don’t know if it’s still available
ATI Debuts STG-44 Rifle to Consumers at Raahauges
http://www.ammoland.com/2012/05/ati-debuts-stg-44-to-consumers/
these guys were making an FG42 clone
http://smgguns.com/?page_id=99