Agree. If magazines are curved, as it seems to me, then Halcon ML57 is possible guess. --Greg-Z (talk) 11:50, 25 August 2019 (EDT)
Other question: Could it be, that the "Grease" guns are actually Argentine FM PAMs?--HighPhigh (talk) 05:37, 29 August 2019 (EDT)
Possibly but I think that there is no way to prove or decline it. PAM is visually just the same as Grease Gun, and original US SMGs were also used by Argentinean military. --Greg-Z (talk) 06:08, 29 August 2019 (EDT)