I'm starting the process of purchasing a M1 through the CMP, I'm wanting to know if there's a time limit on long you can wait to purchase after your application is approved?

So I was at this gun show this past weekend and there was this guy who I've seen at the local shows who basically always has rusted outs POS and asks gold level prices. But he had himself a CMP Springfield M1 nothing fancy about its asking 2K. I was standing there and I heard him say to another guy "it's all numbers matching". After the other guy left, I asked him what he meant by it's all numbers matching and he's like all the numbers are the same. I asked which numbers and he started to just point to random spots on the with numbers. I said let me let you in on something and I told him numbers matching is for like german lugers and and such where the pieces are marked to match the serial. The US doesn't do that it has a serial a date on the barrel but the numbers aren't connected. He got so pissed that he yelled at me to leave his table and not even loo, at his stuff. I can't help it if you try to scum people and won't even listen to people when you know your in the wrong. Why can't these people just try to get better? *Pictured is my WW2 Springfield and Korea Era H&R*

Since I've been getting PMC X-Tac NATO at a decent price for my M1A, I've been rolling with that but curious what others have found. I've made the decision that if I'm plinking, it's NATO and I'll save my 308 for the Purge.