I also have seen the "VP" stamp on 21's.
Craig, one more time--and I'll go slowly, so please follow, because as I said we've been around this mulberry bush several times:
What we do not do in this country, but the Brits are required to do under their rules of proof, is REsubmit a gun to the proofhouse when it has any of various significant modifications. For example, 2 1/2" chambers lengthened to 2 3/4"; 2 3/4" lengthened to 3". I'm not worried about newly-manufactured guns, but rather about guns that are modified and then passed on to the next owner, without that subsequent owner being aware of the modification or its implications. Barrels can even be sleeved in this country, but the gun not so marked. That's the "standard" we don't meet . . . for maybe the umpteenth time.
