This a walking tank I designed.  It fires the HEAT rounds used with a sabot in the M1A2 out of a smaller barrel so there is no need for a sabot and the barrel is lighter.  It carries large magazines of about 18 cartridges for it's main gun and has 500 .50 cal cartridges stored internally for it's secondary armament.  When the magazine is spent the tail mechanism grabs it and holds it out while an ammo drone drops a new one in, stabilizing it's self on the posts on either side of the TR-274's head.  Then the clamp section of the tail spins around so the butt of the magazine is facing up and the ammo drone can retrieve it by grabbing onto the spikes on the tail clamp, and fly off to get it reloaded.