V interesting Paddy and a good find .
Never knew about this item until your review .
Harvey , I notice on the box in bottom R/H corner it mentions the words " blow back "
Which makes this even more interesting to me .
Perhaps Paddy could put some more detail about how this airgun works ?
The only other item I can think of anything like this apart from Drozd is the Kedr which costs double this but has a working bolt with blowback and operates like a real smg .
http://www.rusmilitary.com/html/airpistol_kedr.htm
Carl.