I have a sandbag bunker that goes together with my 30cal. ***but when you shoot the bunker it will dammage the gun and shit and it blows up! ***

how can I solve this ***

Do you think making it into two pieces will solve my problem. but then can you make it so that when you go in game and try it out the sandbag bunker will appear at a certian position near the gun...........I mean can I do that say with model special with a static gun or something?