Trigger housing drops out.

[WarPig1976]

It may be bent.... Try bending it slightly in on itself and try that before replacing it...

Information

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[no4mk1t]

Your problem is caused by one or more of the following conditions. All of these will also contribute to inaccuracy as the action can squirm in the stock much as a bolt rifle with loose screws.

1. The wood fibers in your stock are compressed from 50-70 years of use and no longer provide adequate clamping tension to keep wood and steel secured together.

2. The trunnions on each side of your trigger guard have flat spots from 50-70 years of field stripping and not being lubricated.

3. As mentioned above, the latch hook/tab is not keeping the trigger guard latched securely under recoil.

The first thing to do is determine if one or all of the conditions exist.
Remove the trigger group and examine the trunnions. Compare to this pic of a new trigger guard, and one with heavily worn trunnions.



If the trunnions are still round, or have only a small flat spot, latch the trigger guard closed with it out of the rifle. If it takes moderate effort to unlatch it, the hook or tab is OK and the stock is the culprit.

If heavily worn, the trigger guard can be replaced. Look past the parkerizng and get one with nice round trunnions. Another alternative is if you know someone who can do very fine detailed welding, you could have the trunnions welded up and filed round again.

Issues with the stock can be resolved in two ways.
The temp fix is to shim the trigger guard with thin strips of card stock.
The better fix is to glass bed the trigger group. This is pretty simple to do and made easier if you have a Dremel tool.
The best fix is a new stock.