The Lang is a sidelock and a very attractive gun. All I would need is to lengthen the pull on the stock and it would be good to go. But these days most of my shooting is for doves and clays and a 20 gauge Model 21 that I have found has 30" barrels but would need re-stocking.
I already have a Grant and a Hussey so English guns are not something I do not already have but like I said the Lang just looks good.
But practicallity says the 21 would be more fun with doves and clays.

Mike Proctor