The specs on the P7 series say it has a 105mm barrel, but because of manufacturing tolerances, most are actually just OVER 105mm; since the current law says that anything with a barrel equal to or less than 105mm is prohibited, even if a given barrel happens to be 105.00001mm, it would be legal, while one that measures 105mm on the nose would be prohib. Since they don't have any way to denote that a given barrel is actually (for argument's sake) 105.3mm long, that gets rounded up to 106mm, since it's measurably LONGER than 105mm. There are even some (nominal) 4"/102mm S&W revolvers out there that actually have barrels that are long enough to fall into the "restricted" class, but unless someone measures them, no-one will ever know about them.