You did a fabulous job of restoring the break, that's just incredible!
I've had stock beaks on two airguns and one blackpowder rifle. The BP was a UPS handling problem. One of the airguns, an AA MPR was broken by USPS and the other airgun, my neighbor dropped my Anschutz 2002 while admiring it. The Annie was blue laminate, and it shattered like glass. I couldn't believe my eyes when it happened. He was sitting in a chair and it dropped, maybe 18-24" and it almost hit flat on concrete. I think a drinking glass would have survived better! Of the three stocks that broke, I was able to fix two so that they were totally unnoticeable, but the Annie broke with a lot of shards and hairs, it was a mess and more than two pieces. I was able to put steel rods in all three grips to strengthen them and epoxy them. I put the Annie back together and you couldn't readily see the fix, but once you got close and looked, you could see it. I had to use epoxy to fill the damaged crevices, where there was no wood to replace and color it with RIT dye. It was a good job as far as it goes, but if you looked at it, you could see the swirl of the laminate didn't match up. One good thing was you could not feel it at all.
I've always thought that laminate was far stronger than, say, walnut, but I'm here to tell you that one was not, and I've been a bit leary of them ever since. In airguns, the weight gain of laminate is not worth it to me, when other wood seems to hold up better and is lighter. In powder burners, stability would rule over strength, which is where the laminate is superior. But a properly sealed walnut stock is hard to beat. I love the look of laminate, but wow! how they will break. I've seen pics like this several times.
As to design, the AA MPR had a pretty easy to break design. The one that broke had no physical damage to the box at all. Also, AA started putting a large screw from the inlet down through the grip to strengthen the later models.
