This is an AR1AR-5 Magazine speedloader, for quickly and easily loading your 30 round standard capacity magazines. Works with magpul pmags and STANAG mags. This is a remix of a model originally made by Pyroscooter on Thingiverse, modified to print in two pieces rather than 4 and to remove the badging on the face. 

There is a pusher and a circular tray included, although I personally did not see any reason to print those.