Those 310s are nice with the upper and lower scears I assume. Although there were some drillings and possibly a few doubles pre-WWII but the ounce of prevention being a screw/bolt in the head of the stock was post WWII. Most of the pre-WWII examples wearing such a support is a repair.

Do any of the 310s wear an A&D APUN on the standing breech and were the actions sourced from Germany?

Kind Regards,

Raimey
rse