Win 94 30-30 slips into half cock position on its own

therealfleen said:

Is this normal for these rifles?

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NO! Get it to a gunsmith.
BTW, I don't think that's the "half-cock" position the hammer is slipping into. I think it's the "safety position." Regardless, it shouldn't do that, and I think a competent gunsmith could easily fix the problem.
Anyway, welcome to the forum.

No that’s not normal. Either someone over-smithed the trigger or else the hammer ledge Has got rounded off... either way I would discourage attempting to use it in its current condition.
Take out the hammer and trigger to see what thy look like. If they haven’t been worked on much already there’s probably enough material there to reestablish the ledge with a good file or stone... if not then buy a replacement hammer (or sear... but seems to me it’s usually the hammer)

Welcome to the forum.

The safery nub (catch) locks the sear in place, till the lever depresses the pin. After the pin is depressed, the sear is free to move when the trigger is pulled.

Your problem seems to be a worn hammer , sear engaugement issue. The half cock is there to stop the hammer fall when the trigger is not compressed.

The rifle needs to see a gunsmith.

not only should it not do that, but you should not be able to push the hammer forward from cocked with medium pressure with your thumb. you may want to try cleaning it well as a first step. I can't say, but in theory there could be gunk or a chunk of something in there causing it.

The very late (1980s) 94 lower receiver tang is only held in position by the in letting of the stock. Over oiling thus soaking the wood and over righting the tang screw would destroy this clearance and cause sear/hammer problems. The old Winchester 94 lower tangs were mortised into the receiver thus preventing this problem.
I saw this many times in my small gun shop. jmho

Catpop said:

The very late (1980s) 94 lower receiver tang is only held in position by the in letting of the stock. Over oiling thus soaking the wood and over righting the tang screw would destroy this clearance and cause sear/hammer problems. The old Winchester 94 lower tangs were mortised into the receiver thus preventing this problem.
I saw this many times in my small gun shop. jmho

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That would be a very positive "thing" if it is what is causing the problem for the OP. Potentially it removes the possibility of the rifle having been "bubba'ed". Sounds like a disassembly is in order, and maybe a trip to a 'smith.

Look at bottom of tang. Is screw threaded end protruding lower than tang?
If so back it out to flush with bottom of tang and see if problem persists
If this is the problem, a little epoxy (Brownell acra-glass) in right places will provide the cure.
It has worked for me a few times.
Note: the tang screw is all that holds stock to receiver. Remove it and the two will separate and go back together with no issues. ie best way to clean out action and oil without oil saturating the cheap birch wood stock.
Good luck