Automatic chamber shutter/Automatic repeater

Tested on the model from this linkhttps://makerworld.com/en/models/2165550-sig-sauer-mcx-virtus-sbr-assault-rifle-carbine?from=search#profileId-2348112I designed a cylinder that, with a suitable spring, allows automatic closing of the rifle barrel when you pull the loading mechanism.Of course, this is only a visual effect and there is no possibility to insert any bullet.This part is placed above the trigger and through the central opening of the closing piston, and in between is a spring 0.5-0.8 mm x6-7 mm 120-150 mm, depending on how hard and fast you want the barrel to be closed. Tested on SIG SAUER MCX VIRTUS