CMMG Bravo Echo Trip

grabcad

I designed this model based on the CMMG Bravo 22lr conversion kit for an AR15. This design will not convert your gun into a machine gun and won't trigger the auto sear on a full-auto lower, but it will activate the trigger block on the Fostech Echo Sport, allowing the conversion kit to work with a lower that has the Echo Sport trigger installed. This might also work on other Echo triggers, but I only tested it on the Echo Sport. To get complete functionality and a perfect fit, you may need to make some minor adjustments. The version of this model I printed was slightly too large, so I simply trimmed down the outside until it fit in the receiver. The part that interacts with the trigger block was the correct length, so no adjustments were needed after printing. One of the ears will likely break off during assembly; having it clip on isn't essential for functionality.