[spokeshave]

Not too difficult....also can swop out the firing pin and extractor

[eno_]

Moreover, the sniper has no desire to mask the fact that all the killing is done by one person or group of persons. he has no need to swap barrels, etc. And, on top of that, if he is part of a terrorist cell, he may have been supplied with a rifle that was never part of the normal supply chain in the U.S.

[rudypoot]

"Not too difficult....also can swop out the firing pin and extractor."

Hey wait a minute. That would be breaking the law then! /sarcasm