The ads usually say the Mosins are 91/30s, no information on the dates or where they were manufactured - that requires going to the store and looking them over. However, when I bought mine, they advertised the M40 (I wound up buying an M38). If I remember correctly, the 91/30s are longer than the M38 by about 10 inches.
I bought a refurb M38 for 129 with crap bayonet and 30 rounds ..at gun show