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I have a 14” with rifle night sights on my 870 that Hans did probably 15 years ago now. Best money I ever spent on an 870. I just bought a whole new barrel rather than send him one to cut.

To answer your specific question, I think it depends on what you want out of your shotgun. I bought mine for work, and it has a full stock, so I had to do the tax stamp thing. I needed my shotgun to accurately shoot slugs to 125 yards and pattern buckshot onto a torso sized target out to ~30 yards or so. It does both those things very well.

I’ve never owned a shotgun without a stock that I can actually mount on my shoulder, I just don’t have that need. But it looks like the Shockwave is exactly that, a pistol gripped shotgun. Unless you put a stock on it, slugs on target at 125 is basically out, so it comes down to what you need it to do with buckshot. So, what’s the farthest range you expect to use it? I’d assume pretty darn close, but this is your gun, not mine. If pretty darn close is the case, sending it to Vang won’t do much unless you’ve got a lemon that just won’t throw a decent pattern with anything at 10-15 yards. Beyond that range, in one man’s opinion only as a shotgun instructor, you probably need a different tool.

So, we’re back to cost/benefit. Vangcomp does great work. For example my 14” shoot’s ~ 3”-4” patterns with Federal nine pellet 00 at 10 yards. 25 yard patterns are in the 10 inch change. As a matter of fact I have a Model 29-2 there as we speak for them to send out for NP3+. But, and this is a big but, at the ranges that Shockwave you have is designed to operate it might not do all that much for you. Furthermore, the flight control wad Federal stuff already patterns very well for many shotguns. You might try it before you send the barrel out. Final thing: Remember where your face needs to be in relation to any barrel ports you might be considering. I never advocate shooting a shotgun from one’s hip, but porting could make that a painful process for someone if they decided to try it.

Anyhow, good luck, enjoy your pumpkin launcher!
 
I have the Vang treatment on my about 20 year old Rem 870 that is my HD gun. System works well BUT it now depends on the loads you shoot. The backboring Vang performs is negated by some newer SD rounds like the ones I use, Fed LE 00Buck. Google it an you'll find out a lot more. I also have it on a Wilson Combat model I have. Same deal....was great in the past but some modern rounds negate the backboring benefit. The porting is not something I can say I can feel or have any way to measure.

On a Shockwave, I'd be interested to know if it actually helps at all.
 
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