Show off! I have a Mossberg MB42a, from a batch delivered in 1941, issued to British Army under Lease Lend, only made for British use. It is .22 bolt action, marked US property, The main diffrence is anything offred for sale over here has to be proof marked. There are two proof houses Birmingham nad London. they also proof mark de-activated weapons. Embarrisingly I'd been shooting the Mossberg for a while before it was noticed , no proof mark! The reason is it had gone stright into military use and been transferred to a Sea Cadet unit where it stayed till 1990. A quick trip to Birmingham was order of the day. so now has all its marks.