This recently came into the shop, it's an Inland M1 Carbine with an M84 sniper scope on it. The mount looks to be original and not new production, it attaches in place of the rear sight and again to the bbl. The mount is marked 8247-39m1. The thing is in pristine condition, almost like it was unissued, the scope looks like it's almost new. It has the bayonet lug and cone flas surpressor. So what about these things, is this a real sniper gun or something someone cobbled together? Serial number for the gun is 6 digit and ends with 7418 if that helps. Scope serial is 17324. What can you guys tell me about this thing?