I found a short barrel to be a big help for speedball.

My J&J 12" felt clumsy getting it around or over a bunker and onto targets.

I cut my stock barrel down to about 4" past the barrel-adapter and I can pop-out and take a shot really fast.

I am going to try it with a Flatline, just to see how it works. I might be able to at least pick a guy off from the break