So all the scare stories about how such weapons can supposedly annihilate orphanages with a single press of the trigger are rather beside the point.
Furrow used the Uzi knock-off at the North Valley Jewish Community Center (where in spite of the number of rounds fired, he failed to actually kill anyone), and he used the Glock to kill Ileto.
The Glock was apparently purchased by the police department of Cosmopolis, WA (strength: 5 sworn officers
http://www.cityofcosmopolis.com/police.html). The department found the guns were too small, and traded them for larger models at a local FFL, Don's Guns, whose owner, Donald Dineen, was also a reserve officer with Cosmopolis PD. Dineen sold the gun to a local paint shop owner named Dave Wright. At some point, a friend of Wright's named Andrew Palmer was going to go to a gun show in Spokane to sell some of his own guns, and Wright gave Palmer several of his own guns, including the Glock, to sell while he was there. Palmer apparently sold the Glock in Spokane,
but it's not known that Furrow was the person who bought it. Spokane has its share of white supremacist types, boasting its own Klan chapter and a Christian Identity group. Given Furrow's contacts with white supremacist types, it's far from implausible that a local one bought it and subsequently sold it to Furrow. Certainly we can rule out collusion between Palmer and Furrow; Spokane is about as far as you can get from Cosmopolis (which is on Gray's Harbor, an inlet off the Pacific) without leaving the state, and Furrow lived in Everett. It's 140 miles from Cosmopolis to Everett, 370 from Cosmopolis to Spokane, and 300 miles from Everett to Spokane, so that would have been a remarkably elaborate way to make the sale.
We're dealing with at least one offense here, which is that Palmer took Wright's guns to sell in Spokane. As an unlicensed seller, you can sell firearms
from your own collection. You can't sell other people's guns for them. There's no legal loophole there. Regardless of whether the Glock was sold to Furrow in Spokane, or to another party who subsequently transferred it to Furrow, there's no legal loophole there either: it's a class C felony under Washington state law (RCW 9.41.080) to transfer a firearm to someone you have "reasonable cause to believe is ineligible under RCW 9.41.040 to possess a firearm" as Furrow was, and a class B felony for Furrow to possess it. The fact that such a sale can physically take place isn't a "loophole" anymore than it's a "loophole" that it is physically possible for someone to burgle my house.
Falsehood: the Glock 26 was "originally designed for the Austrian army."
It wasn't; it was designed for the US private market, specifically to be compliant with the 1994 ban on "high-capacity" magazines.
Falsehoods: the Norinco 320 is a "submachine gun clone," "originally designed for the Israeli army." Cosmetically, the weapon's very similar to a military Uzi, but the guts are quite different. The military Uzi fires from an open bolt with a fixed firing pin (which is simply a protrusion on the bolt face; semi-auto-only Uzis fire from a closed bolt, which requires a hammer to strike a floating firing pin. Semi-auto-Uzis also have a different feed ramp, fitted with a "restrictor ring" that will interfere with a full-auto bolt. An analogy might be taking a Humvee, replacing the 150hp multifuel engine with a 90hp gasoline engine, converting it to a two-wheel drive, making it physically impossible to reinstall the original powerplant and drive train, and claiming that it's "just like the U.S. Army uses."
Falsehood: the Norinco 320 Uzi is an "assault weapon."
The 320 was imported while the 1994 "assault weapons ban" was in force, and was designed to comply with it. While it as semi-auto and accepted detachable magazines, it had a "thumbhole" stock (no pistol grip, or folding/collapsing stock), no bayonet lug, an unthreaded barrel (i.e. incapable of being fitted with a flash hider or grenade launcher spigot), and no bayonet lug. While it could accept "high-capacity" Uzi magazines (which exist with 25-, 32- and 40-round capacities), it was sold with ones that would hold only ten rounds, thus making the claimed capacity of 32 rounds misleading.
I might note that there's some misleading intent behind the repeated claims that weapons were "originally designed for" some army. The idea, presumably, being to make the uninformed think that military weapons must, by definition, be more powerful and more devastating than "civilian" weapons. However, speaking as someone who served in an army (the Royal Netherlands Army) that used both the Glock 17 and the Uzi submachine gun (the latter having since been replaced), I can say that most armed forces do not consider handguns and SMGs to be "casualty-makers." These weapons are typically issued to people who normally shouldn't have to come within small arms range of opposing forces. Pistols are issued to staff officers (majors and above) and medics; SMGs are issued to subaltern combat officers (company and platoon commanders), truck drivers, staff NCOs, etc. The purpose of these weapons in a military role (excepting use by special forces types) is to allow the bearer to lay down some suppressive fire and make a run for it while the enemy is seeking cover. People who are supposed to use small arms to inflict casualties on the enemy are issued rifles and machine guns.
Moreover, the term "originally designed for" some army also applies to a plethora of sporting weapons. Most bolt-action hunting rifles use a Mauser-type action; the Mauser was originally designed for the German army. In 1871.
Falsehood: the Maadi RML is an "assault weapon."
The RML was imported from Egypt both prior and during the 1994 AWB being in force. The ones imported in 1993 were, as it happens, fully compliant with the federal "assault weapons" ban, while the ones imported in 1995-96 were even compliant with the California 1989 AWB; the difference being that the 1993 imports had a threaded barrel, whereas the 1995-96 imports had an unthreaded barrel. In addition, the rifles were sold with a single 5-round magazine.
Half-truth: the magazine capacity of the Bushmaster XM-15 E25 is 40 rounds.
AR-15/M16-type rifles accept "STANAG/USGI"-compliant magazines, which come a variety of capacities. This includes 40-round boxes, but 20- and 30-round ones the most common.
In addition, there is a good possibility that the Imbels and the Bushmaster were "post-ban" models, and thus not "assault weapons," though without further information, I can't say for certain.