Semiautomatic Lego Gun/ Revised Edition

by adding a support system my https://www.instructables.com/id/Semiautomatic_Lego_gun/ is a lot better, but you need to build my other gun first; i only showed pictures of the support structure but if you don't understand it almost anything works. it is loaded like the other semiautomatic gun.
the improvements are
-can hold now 10-12 rubber bands
-stronger
but...
-bigger
-slower firing rate