Vang comp is nothing new to the shotgun smith, you can have any good smith do a modified forcing cone, and the job result in a much better finished product then Vang comp. Vang is a great guy and I m not try to short change him. but he just took a old trap shooter trick and add a mag port in front of the barrel. Vang is the first to add this feature to the tactical application. I personally don't like the magna porting in the muzzle but the forcing cone work is great, the pattern is amazing as the range begin to extend.
one thing, Vang don't polish the in ternal after his work is finished. The Vang barrel I had done gets dirty very qucikly. the other barrel I had(After I learn the difference, and had a local gunsmith do the forcing cone) is polished and I have shot five hundred plus and have not send a brush down the bore yet. some gun scrubber and everythign gets flush out.
I hear Vang is contracting Bar-Sto to do their 870 barrels. this might yeild a better product. I will have to see when Stony bring the product in town.