Originally Posted by The Inflicted
I suppose the idea is that a field owner would put one of these special barrels on a gun, assume it has dropped the velocity as advertised, and not re-chrono before issuing it to children.
Most I would assume would still rechrono (just in case), but the object is to make that easier. Many guns simply won't turn down that low with out modification, and it's easier to swap barrels than to swap main springs. Plus, if you happen to have a gun that can be turned down that low and you hand it to a renter, there's a chance he might go and turn it up himself. So if the new barrel means it not maxed out near the desired limit all the better.