Hmmm. DP stands for "Drill Purpose" which means the rifle, for various reasons has been put aside by the government and is not to be fired. This rifle is lacking the 'DP' stamp anywhere else so I would bet that the barrel band has been taken from another rifle. I also believe, and will be corrected if I'm wrong that you were more likely to see "EY" stamped on the receiver for "Emergency use onlY" on these rifles. As with all milsurps, if you're not sure, don't shoot it! I'd ask for a few day's inspection with right of return and get an experienced gunsmith's opinion. As is, without a guarantee of serviceability $600.00 is too much.