Incidentally, this is what nitro Proof is, here it is. It is a mark to indicate the gun was pressure tested with a cartridge at least 30 percent over it's normal pressure.(This number might be wrong) Just in case you were wondering what everyone was talking about. NOTE: MIne is 9025 Prefix N or as they might call a lazy n?, not sure either if this is a lazy n? My gun has the proof, your doesn't. So we will leave it up to one of these guys to decdie how many more days mine was made than yours, but I bet they were made in the same month, that part of it, I DO NOT know, but I bet someone on here knows the duration of time between 34XXn and 90XXn.
Anyone?
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