[L473ncy]

I don't think anyone else said it directly but the connector in the OP's post is a Large Female Tamiya to Small/Mini Male Tamiya. Usually found in the buttstock of old school fullstock AEG's like the M16 and such I honestly don't know why they do that but if you're going to change to deans, IMO you might as well take it all apart and run it straight wire to the deans connector (ie. cut out the large tamiya and splice the wires together).