Great documents Snautzer!
I can't find the 102-160 rear mount itself but, on the MG151 you can see the rear lugs that slide onto the two steel prongs as the gun is pushed forward into position and the locking levers that stop it moving back until the weapon is locked in position on its complete mount. Great!
Also great is the detail on the MG 213. I have fired thousands of rounds Air to Air and Air to Ground in the 30mm ADEN version and the 27mm BK. A great gun!
Eng