as I understand the caliber issue of "assault weapons" the way europe, mexico and others go about it is to ban anything the service and police use. so if the cops use 9mm handguns and .223/.556 m-16s, then those caliber/cartridges are assault weapons. a 22-250 isn't scary, but a .223 is (same caliber!!!!!). oh better, a 9mm is scary but a hot .357 isn't.
terrorists will use 50bmg to snipe airliner pilots if we don't ban them, don't worry about 416 barrett though!!!!!!!
during the earlier part of the 20th century it was automatic weapons (mainly machine guns), now it's automatic and semi-auto that can be "easily" converted to full auto- but they're trying to go for power, accuracy, range, concealability, reliability, financial attainability.....
basically it should be registered, licensed every year- just like the owner!, way too large to carry around much less conceal (30lbs?) but not so heavy that it reduces recoil and ups the accuracy, can't have a flash hider or silencer so the victims can see the shooter and shoot back even though the victims are probably sheep anyways, can't have "handguards" because that means it HAS TO fire 100's of rounds and get burning hot by killing lots of innocent people, can't have a bayonet lug because that wouldn't be good for home defense but for offensively getting within striking distance of the unarmed sheep which would NOT make it easier to disarm the nutty shooter
, can't be semi-automatic or even easily reloaded for quick follow up shots- but ESPECIALLY not semi-auto since that takes down the recoil and would make it accurate (which would make it a sniper weapon), can't be a rifle without a stock since it's "good" for a driveby then... which wouldn't hit anything from the hands of any idiot that would try to shoot like that but sure it will stop them since a pistol is fine for drivebys?, can't put a stock on a pistol since that would make it accurate which would make it a sniper weapon- and harder to conceal and actually sneak around with, can't use lasers since it's SOOOO much better than sights and makes a noonie into rambo JUST LIKE THAT with no training whatsoever, the gun should be extremely expensive so "the wrong people" can't afford it, and the ammo should be about impossible to acquire- and the handloading equipment should be registered under cifta.
and if you wonder why a thompson encore or something similiar is okay, while a short rifle or a "powerful" pistol is wrong.... well you need to remember that the encore is hard to conceal, slow to load, doesn't wear a stock for accuracy and REALLY takes skill to use, punishing recoil.... if the encore was really, really heavy then it would be perfect (it's already expensive
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you can't shoot liberals but you can tell them to their faces what they are. cowards and sheep, and tell them often (just not at work).