you could probably a nuclear material mission. sorta like capture the flag, but with a weird twist. you know the game with one flag in the middle, and you have to get it back to your base, basically that, but different. so get a metal lunch box and spray paint it black. then put a nuclear material sign on it.
Then you designate a few people with only pistols or short range low fps gun, and they can pick it up. because the thing is nuclear[so to say]. they have a small group,say 4, that has to travel with the designated carriers. they cannot touch the box. oh the teams have to have something to put the lunch box in. say a slightly bigger case. Because if they don't their sent back to the spawn point because they died. when a team holding it is eliminated, they have to take the lunch box out of their carrier. and the other team can pick t up, only if they have a designated carrier.
A non-designated carrier cannot pick it up. nor can he carry the box the lunch box is in. after the designated carrier has gotten it to their spawn, they have to "detox" it. for that just put the lunch box on a table, and start BIG timer. When the timer counts down and finishes that team wins. While the nuclear material is at spawn a secondary spawn must be used, because only the designated carrier and the team of 4 can be their. also the 4 and the carry have to "detox" somehow to. haven't figured that out.
the other team can assault while they are detoxing. But remember only the 4 can be in the base. the others can be around it. the 4 and designated carrier can take out the material and get it back to their base. then try to "detox" it.
That's more of a game mode than a prop thing isn't it. oh well. and actual prop is drop down walls. put up a wall with a large square cut out for another board, then attacks hinges to the bottom of the hole. then attach another board to the hole cut out, and make it so something can be sot to bring the wall down, like they shot the wall out.
P.S i think this is my longest post on this forum.