M1 Gas cylinder plug won't budge. Please help.

[surplusaddict]

I bought a WW2 vintage Springfield M1 from a reputable dealer at a gun show recently. It has a early Marlin barrel I was told, so I wanted to check on top of the barrel for markings since there's none behind the op. Rod. I've tried a socket end, large Phillips head, I mean this thing is seized. Thanks.

Information

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[Mark in Rochester]

Try a M10 cleaning handle with a rod section inserted in hole to form a T shape

Soak with penetrating oil also

Be sure no weld on gas cylinder from drill rifle

[Bob Seijas]

If a socket doesn't work, the M10 handle has no chance. WD40 and a longer handle on the ratchet (slip a pipe over it).

[WarPig1976]

(slip a pipe over it).

a.k.a= get a bigger hammer!!..

[Buntlineguy]

Try heating with heat gun. Do not use flame. Heat gun - penetrating oil - heat - oil etc. heat will help oil to work its way in. Just don't overdo it. PATIENCE.
B

[Brian Dick]

Apply a shot of PB Blaster which you can find at most NAPA stores. Let it sit overnight and it should break loose with much less effort. It's a penetrating catalyst and works much better than normal penetrant/oils like WD40.

[surplusaddict]

I finally got it off by using some CLP and letting it soak for an hour. After taking off the other parts I noticed it has a 2nd contract Marlin barrel installed. The chamber is still in the WHITE. How rare were the Marlin barrels and were they of good quality? Thanks for the help.

[Orlando]

Second contract Marlin barrels are not really rare or sought after and do not bring a premium.

[browningautorifle]

Try shooting a couple of clips through it and it may break whatever hold is on it. You also might have to grab the front end in a protected jaws vise to hold it while you come on to it. Sometimes the hands aren't enough.

[musketjon]

Marlin barrels were not known for their superb accuracy.
Jon