Vang Comp On Threaded 12 gauge barrell?

You would have to talk to Casey to be sure, but you could move the porting back a couple of inches to clear the choke tubes. The back boring and forcing cone shouldn't be a problem.
 
add a breaching attachment / muzzle break casey sells them and they can cut wire too i think if your trying to go through a fence. Not that you'll need that but you don't have to move your porting back, and its like a choke you can just screw/unscrew it when you don't want to use it. They look badass too.
 
There are a few screw in tactical chokes. Unless you want something really specific I don't think you need to thread the outer barrel.
 
Casey can do just the back bore and forcing cone work. You don't have to get the porting done.
00 buck groupings at 25yrds is greatly improved.
 
Yeah this model already comes with the breaching muzzle but I took it off and put an improved choke in. so would you say that its better not to get the porting done to this barrel, or its just unnecessary ?

http://www.remington.com/~/media/Images/Firearms/Shotguns/Model-870/Model-870-Express-Tactical/870-Express-Tactical-81198-prod.ashx

The porting is supposed to allow some of the "blast" to escape vertically keeping the front of the bbl more level for faster follow up shots. I personlly don't like the way the ports "look" and some have reported more time is involved in cleaning the ports of powder and husk residue.
I'd save myself the extra $50 and not get the porting done...but thats my opinion.
 
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