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new gun barrel won't get clean or gas ports?
i just bought a mossberg 930 12 gauge shotgun. i'm a real newbie and have never owned a gun before, but i used hoppes solvent with cloth and then a wire brush and a soft brush extension and there is still some residue about 6 inches in from the breech side of the gun. is this normal? is it ok that that residue is in there or does it need to come out. i've used all the tools i have and it it still won't come out. i put some of the lube in there after fiinishing cleaning too.
Additional Details
so i went to the store today where i bought it. they said that these were the "gas ports" and are supposed to be there. they look like they are protruding to me, but they said they are actually indentations and are supposed to be there. can anybody confirm this? they are about 6 or eight 8 inches down from the breech side; the two holes/residue are right above the cylinder on the barrel where the gas piston assembly connect into. thanks again.
5 Answers
- Bob KLv 510 years ago
The gas ports are a bit farther in like where the magazine extension is brazed on to the barrel.
But good description.
When cleaning the bore of a gas powered shotgun it is also a good idea to clean the single or double gas ports that power the semi-auto portion of the shotgun.
The ports are most likely in the discolored portion you see in the bore. To clean the ports or vents, remove the barrel from the rest of the shotgun. Under the barrel and in front of the magazine tube is a round nut, unscrew it and pull the barrel forward off the receiver and mag tube.
Invert the barrel and look at the extension. On the barrel side there should be a vent or two. These are holes drilled into the barrel to vent gas to the operating portion of the gas system around the magazine tube.
Use a pipe cleaner dipped in cleaning solvent to clean out these vents. DO NOT! And I repeat. Do not use anything harder than a piece of wood carved to make a tool to clean out the vents.Do not block either or gas system will not work anymore.
And do not leave anything sticking up into the barrel or you risk blowing up the barrel next time you shoot.
One last do not...do not use a drill to clean out or enlarge vent holes...you risk making the vent holes a larger diameter which allows more gas to enter vents making the parts move faster/ harder.
To clean this area buy a straight bore brush with no fuzzies on it. Wrap a shotgun patch or a patch you make and dip in solvent. Scrub. And I mean scrub to clean the bore in the vent area.
Or not. It is your shotgun.
Then scrub clean the ring portion/housing under the vents as gas piles much powder residue there.
Not cleaning the vents in the first reason gas systems quit working on a semi auto shotgun. Not cleaning the ring housing and the outer portion of the magazine tube where the friction rings and other parts happily slam to and fro is another reason.
And the last is shooting a shotgun with wet oily parts. The oil collects powder residue at an alarming rate.
So clean. Oil. And let oil dry for a couple hours on the gas system parts over the magazine tube and then wipe dry with a cloth and reassamble shotgun.
- cmcvprLv 510 years ago
Yup, gas ports. After the shot passes them some of the expanding gasses go down them and that's what makes the action cycle.
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