Feburary 1931
That the barrel (not the gun, the BARREL) was made in June 1944. Posibbly an M1 Garand, or an 1903 Springfield?
This means there is no "choke" or narrowing of the barrel at the muzzle.
It can mean that it has passed proof testing, could be a maker's mark, could be an inspector mark.
My guess is that the NM stands for National Match, a better quality barrel
Do you mean a hammerless single-shot, double-barrel, slide-action...? sales@countrygunsmith.net
What does the a18 stamp mean
A stamp from Germany.
wat does it mean plzs
Need more information to answer, especially pertaining to the type of firearm it is. It could be an arsenal stamp and date of manufacture, or something else entirely.
I'm assuming that you are referring to the Remington Model Eleven? (11) shotgun? That anchor stamp is most likely that of an inspector who was issued that stamp symbol and stamped the barrel after it was "proofed", which means that it survived a higher pressure load than what would normally be used for hunting, etc.
If you mean springfield USA 6 1/2 hours with a tail wind.
It means one individual stamp.