All nice replicas!! I've toured Reed's collection and it is quite impressive. In fact, the last time I visited I was in the company of General Kalashnikov, who remarked that he was also very impressed with Reed's collection, but puzzled by the lack of AK variants. Reed has no Ak variants in the lot!!
The M607 should have a 10" barrel and the first issue sound moderator with no flash hider, but pretty close!
This is a great site for parts, accessories and resources for these early replicas;
http://retroblackrifle.com/