The way Hooben had the recoil servo mounted it didn't have enough room to have a decent throw/motion for the barrel so I mounted the "L" bracket to the old mount point to give it more throw length. I do have to find a way to stabilize the barrel as it flops around during the recoil stroke. I reused the Hooben elevation motor and it works well. I couldn't find my Taigen Leopard 2A6 sound card so I just threw my JS2 card in there for now to have sound.