Shaker am I seeing a portion of the inside of the thru hole and tennon broken as well as the crack that is visible. If it is not, why not fix this yourself? If it is a clean crack, meaning no one has tried to fix it with silicone lol, then a good carpenter's glue will make that break stronger than the wood on either side of it.
Looks like an easy fix. Put a good coating of glue in the cracked area. Wrap the outside tightly with a long rubber band. Then put a clamp on the inside piece to close the gap. Let it sit for a couple days and you should be good to go. HMB
Your stock looks better than the one I am presently using. Get some epoxy, wrap the stock with electrical tape good and tight, and after a week take the tape off. It will be as good as new.
To get a stock to crack like that something was very very wrong in the first place. It does not look like a very hi grade stock, a side view would give a better choice of trash or fix. Looks like it was driven over to get a stock to crack like that and that bad. A stock from Wenig I think would be a better choice, they have a lot of finished ones. A fix would cost over a $100 I think or close to it. Personally I would not fix it. You can find a used stock on here where a shooter had a custom stock made for his Beretta.
Acraglass and a good secure clamp setup...the 390 recoil spring tube has plenty of extra room inside the hole circumference..I'd also get a small piece glass matting and impregnate it with the acraglass and lay the mesh into the inside down the hole...will work fine
Here's another pic of the broken stock. True story - several years ago a very good friend was putting his gun in a gunrack at a sporting clays club and the whole rack tipped over and all of the guns hit the pavement (ouch!). Not my buddy's fault as the rack wasn't secured properly to the building it was attached to.
I agree on the keeping the Gorilla glue (and polyeurathanes in general)away from gunstocks. They need water to activate and then bubble and expand so they are a mother to clean up on a finished piece. Acraglas is the best!