Abstract: An ejection assembly for ejecting an ejection body comprises an ejection channel and an anti-recoil channel; a barrier structure having a first interface boundary and a second interface boundary, including a barrier portion between the first interface boundary and the second interface boundaries; an attachment mechanism for fastening the barrier structure between the ejection channel and the anti-recoil channel; an ejection activation mechanism housed within the barrier structure adjacent the first interface boundary, to initiate ignition of ejection propulsion material contained in an ejection capsule placed adjacent the first interface boundary; and an anti-recoil activation mechanism housed within the barrier structure adjacent the second interface boundary, to initiate the ignition of anti-recoil propulsion material contained in an ejection capsule placed adjacent the second interface boundary.