Blocking barrel ports


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statman92
March 18, 2014, 10:27 PM
I recently bought a Mossberg 500 special hunter, and because of the 20 ports on the barrel and the ill fit of the stock to me, it gives me a significant upper cut when I fire it ... like swollen face kind of upper cut. Rather than have the stock altered to fit me (which would cost more the gun), I was thinking of changing the barrel to one with no ports or blocking the ports on the existing barrel. The problem with the former is I can't find one available (thanks Obama), and turkey season is coming soon. SO, I was wondering if anyone has tried blocking the ports and if-so how?

This might be a stupid idea, but I was thinking of putting a pipe clamp over them just for the turkey hunt. Anyone tried that?

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rcmodel
March 18, 2014, 10:33 PM
If it kicks that hard with the ports?

It will kick harder without the ports.

The ports are there to supposedly reduce recoil somewhat.

But a pipe clamp on the muzzle?

Well, it would add weight in the right place to help hold the muzzle down!

rc

statman92
March 18, 2014, 10:40 PM
The ports are on the top of the barrel so it pushes it down, rather violently, which makes the butt go up, equally violently. The shove to the rear doesn't bother me on shotguns, but that upper cut ... haven't been hit that hard since I boxed heavyweight. I have heard this isn't that uncommon with a stock that fits someone really badly, and that building up the stock will cure it. But, that would likely cost more than the gun (it was cheap).

rcmodel
March 18, 2014, 11:10 PM
I don't think that is what's happening.
Recoil automatically seats the recoil pad in your shoulder, and due to the drop in the stock, the gun rotates upward from where it is placed in your shoulder pocket.

I have never fired a gun that defies the laws of motion like you describe.

How about a lace-on cheek pad?
http://www.cabelas.com/product/Triple-K-Leather-Cheek-Pad/706669.uts

http://www.blackhawk.com/product/Rifle-Cheek-Pad,605,662.htm

rc

statman92
March 19, 2014, 12:14 AM
Well, my question was about the experience people have had with blocking ports, not about physics. Have a nice day.

Russian Hammer
March 19, 2014, 01:49 AM
Yes you can block the ports, some muzzle brakes even have a built in piece allowing you to do so, that said I think rcmodel is trying to keep you from wasting time and money. Ported shotgun barrels are generally only marginally effective, and if you have found one that is so effective it pushes the gun down to the degree you claim, post a video showing it and I'll buy the barrel from you for a nice chunk of cash.

JSH1
March 19, 2014, 02:24 AM
There are 130 Mossberg 500 barrels on Ebay right now.

oneounceload
March 19, 2014, 09:43 AM
It would be easier to buy a barrel without ports. Your ill-fitting stock is the culprit, not the ports, as there is not enough pressure generated in a shotgun for porting to do much, if anything. Getting the stock properly fitted is the correct way to go.

PBR Streetgang
March 19, 2014, 09:48 AM
Mossberg 500 barrels and different size stocks are available for a relatively inexpensive price. Do you need a longer or shorter stock?

jaguarxk120
March 19, 2014, 09:50 AM
The ports are there mainly for looks and do nothing to reduce recoil.

Just buy a barrel off of ebay as others have suggested. If you sell the gun you can keep the extra barrel and sell it or put it on another 500.

ugaarguy
March 19, 2014, 10:14 AM
Statman, there is no cost effective way to block the ports on a shotgun bbl. The most cost effective solution is to buy a bbl that isn't ported, and sell the ported bbl.

19-3Ben
March 19, 2014, 10:58 AM
Instead of buying a new barrel, since the porting probably isn't the issue here, but you mentioned several times that the stock doesn't fit you well.
...ill fit of the stock to me.
Seems to me that getting a new stock may be in order. Forget having the current stock modified, as that costs a ton of money, as you mentioned. But replacement stocks, and even adjustable LOP stocks can be had for $75 or less. I'd try to find a stock that fits better. If you're getting that much movement in recoil, the stock may not be properly braced against your shoulder. A stock that adjusts to your desired LOP may fix that.
I might also add that a pistol grip stock may help, as it gives your shooting hand something to really grab onto and another point to absorb recoil.

Edit do add:

Perhaps something like this. (http://www.amazon.com/BLACKHAWK-PowerPak-System-Modular-Carrier/dp/B002D4BGKO/ref=sr_1_3?s=sporting-goods&ie=UTF8&qid=1395237613&sr=1-3&keywords=mossberg+500+blackhawk+stock) Might be worth the $40 for the experiment.

oneounceload
March 19, 2014, 11:56 AM
Getting an adjustable stock when the problem has yet to be determined can also wind up being a waste of money. One needs to know what is wrong before one can attempt to correct it. There is a LOT more to stock fit than using an adjustable LOP. Cast, drop at heel and drop at comb (what sounds like might be the culprits), toe in or out, pitch, type of grip, etc. all play into having a shotgun fit. The gun should fit YOU; you should not fit yourself to the gun.

Sam Cade
March 19, 2014, 12:42 PM
In all seriousness, duct tape.
http://ecx.images-amazon.com/images/I/21ZF5rz2nNL._SL500_AA300_.jpg

Wrap the ports with a towel and tightly cover with duct tape.

Shoot it a few times with the ports occluded thusly and tell us what the net result was.

oneounceload
March 19, 2014, 01:02 PM
Besides a messy towel?

wally247
March 19, 2014, 01:10 PM
Yes you'll have a messy towel, but you'll either solve the problem or eliminate a variable.

oneounceload
March 19, 2014, 01:34 PM
That won't solve a problem; even duct tape applied directly will get blown off; the holes would need to be filled typically by some form of welding or similar and that would destroy the heat treatment of the barrel. It still does not address his ill-fitting stock

WestKentucky
March 19, 2014, 01:39 PM
Or sell the gun and buy one that fits. Seems that there is already bad blood towards the gun for some reason. Walmart sells shotguns pretty cheap. Sell one, buy another. For what you would pay for a barrel or a stock you could sell your gun, add the cash you would use to make you happy with this one and buy a brand new one. Mossberg maverick88 is cheap but it's still a 500. Rem870 isn't much more. Stevens, NEF, and other 12 ga pumps can be had for less. I'm not sure why were even talking about fancy stocks and new barrels.

jakk280rem
March 19, 2014, 03:17 PM
I think Sam was just trying to get the OP to spend as little money as possible to learn a lesson in common sense and physics. He wasn't actually offering up a towel and duct tape as a fix for the guys problem.

JSH1
March 19, 2014, 04:09 PM
Covering the ports would prove that they aren't the problem. I would recommend a thin layer of metal like a soda can as the first layer and then cover with duct tape.

I suspect the OP is long gone. He signed off in post #5 and made it clear that he isn't interested in learning what is causing his problem

Virginian
March 19, 2014, 07:34 PM
Metalized duct tape will work to cover the ports. A buddy used some to cover the ports on his Gold Sporting just to see if there was any noticeable effect and it worked for 100 rounds anyway. He did cover it with one wrap of black electrical tape so the color of the duct tape didn't mess him up. The pressure out there is pretty darned low.

eastbank
March 19, 2014, 07:47 PM
when the 94 AE winchester timber carbine first came out i bought one, thinking it would be a perfect heavy brush rifle with a short barrel(18") with ports in 444 marlin. i have shot the rifle exactly 15 times, 14 shots to sight it in and get use to the kick with good ear protection on and one shot to kill a six point buck. my ears were ringing all afternoon and it has been setting in my gun room ever since and i would have gotten rid of it but it has gone up in price, so i keep it. eastbank.

Sam Cade
March 20, 2014, 12:27 AM
I think Sam was just trying to get the OP to spend as little money as possible to learn a lesson in common sense and physics.

Exactly.



The pressure out there is pretty darned low.

Boyle's law is a real joykiller sometimes. ;)

rcmodel
March 20, 2014, 12:39 AM
Well, I once had a finger right next to a port on my 16" Marlin .44 Mag Guide-Gun while shooting out my truck window.

You only want to do that once I'm here to tell ya!

Of course .44 Mag muzzle pressure is much higher then 12ga shotgun muzzle pressure.

But there is something coming out of those shotgun ports, doing something, or they wouldn't waste money drilling them in $10,000 Perazzi Trap guns.

rc

Sam Cade
March 20, 2014, 01:10 AM
Of course .44 Mag muzzle pressure is much higher then 12ga shotgun muzzle pressure.

About three times the chamber pressure of a 12 gauge.

Remember that pressure in the bore increases exponentially
as barrel length decreases.

A long barreled shotgun just doesn't have much huff to work with.



But there is something coming out of those shotgun ports, doing something, or they wouldn't waste money drilling them in $10,000 Perazzi Trap guns.

They do look cool.

I had the opportunity to shoot two DT10s last year that were twins other than one being ported.
I could not for the life of me tell any difference between the two.

rcmodel
March 20, 2014, 01:14 AM
Remember that pressure in the bore increases exponentiallyThere ya go, using those big words again!

Dang Nab It!

rc

orphanedcowboy
March 20, 2014, 04:42 AM
You can use a barrel clamps and a soda can cut to fit over the ports.

It will not fix your problem!

RC addressed it, pitch and fit are the issues. The ports should in theory keep the barrel down, physics are working against you, the gun does not fit you and nothing you do to the barrel will solve it.

Virginian
March 20, 2014, 04:50 AM
Remember that pressure in the bore increases exponentially

By what factor?

oneounceload
March 20, 2014, 08:17 AM
But there is something coming out of those shotgun ports, doing something, or they wouldn't waste money drilling them in $10,000 Perazzi Trap guns.

Except that neither Perazzi, Kreighoff, Kolar, Blaser, Zoli, H&H, Beretta or ANY of the major gun makers except Browning do that.

If it REALLY made a difference, why doesn't Browning do it on their field models which are lighter guns typically shooting heavier loads? (Because it is purely marketing hype)

Macchina
March 20, 2014, 11:05 AM
By what factor?
It's the little number in the upper right hand corner ;)

Sam Cade
March 20, 2014, 03:05 PM
It's the little number in the upper right hand corner ;)

http://i.huffpost.com/gen/239748/thumbs/s-ARSENIO-large300.jpg

Warm me first if you are going to do that. :D

Sam Cade
March 20, 2014, 03:12 PM
By what factor?

Dig this article:
http://sadefensejournal.com/wp/?p=1093

Graph for 5.56. I figure that 12 gauge would be even steeper.
http://sadefensejournal.com/wp/wp-content/uploads/2012/02/barrel5.jpg

oneounceload
March 20, 2014, 05:01 PM
Actually, more likely even flatter as the 12 usually maxes out about 10500-11500

Sam Cade
March 20, 2014, 05:58 PM
Fast powder and a large bore size are going to make the pressure curve steep.

http://mcb-homis.com/shotgunpressure/old/pressurevstime.jpg

http://www.thehighroad.org/attachment.php?attachmentid=196357&stc=1&d=1395349156

5.56 over time as a direct comparator.

http://www.luckygunner.com/labs/wp-content/uploads/2012/06/Replacement-5.56mm-NATO-.png


But anyway, lest we get involved in endless digression, porting on a shotgun can't do much if it is at the muzzle.

Now, it would probably work pretty well if you had your barrel ported maybe 6 inches past the chamber. The downside would be that it would blow your hat off every time you pulled the trigger. :D

blarby
March 20, 2014, 06:06 PM
I have never fired a gun that defies the laws of motion like you describe.

Thats pretty much it.

I own the BBL he's trying to bubba into some sort of NFA law defying towel wrapped club.

It works like RC described.

You are getting smacked because your cheekweld on the stock is poor.

Those ten ports are not lever camming the shotgun into your face.

You are either holding it quite wrong, welding it quite wrong, or quite possibly both.


In order for the ports to force the gun bbl down fast enough, and hard enough, to force the stock into slapping you, your front hand would literally have to be a hinge.... kinda like a seesaw. And your trigger hand would have to be doing absolutely nothing. And you'd have to have no........ no..... what do they call that ?

Physics

Yes, you'd need to throw all those out the window.

Sam Cade
March 20, 2014, 07:05 PM
Ok, I guess we have played this tune for all it is worth.

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