Now before you go cuttin' that barrel ya might want to take it out and shoot it in a vouple of matches.  The only real advantage of a shorter barrel is style and easier movement in close quarters.  Those long barrels with chokes just drop those fallers like they were hit with a sledge hammer. If your club has any of those poppers that throw stuff in the air you can really dust 'em.  
If you really have to have a shorter barrel, I would but a new one and have it installed and keep the original.
If you decide to cut it- do you 
need chokes, no, but sometimes they sure are nice.
Do you need to get a new bead installed- I would say yes.  The targets may be close, but you still need to aim at some of them. :grin: 
Just my opinion, since you asked. 
