I don't like to cross-pollinate threads from different forum's, but I thought this might be of interest here?  It's a curb side find, consisting of a pair of AR-3a's, and a single AR-3F?  So, not knowing anything about an AR-3F, I thought I'd post this link to the AK thread in question.  Maybe someone here, could help out there, or find this thread of interest?  I do. The AK Thread. A Trio fo Vintage Soldiers... The speaker in question.