I'd recommend not using the term "SAW" for these types of rifles. SAW is a military designation for squad automatic weapon... a medium-duty machine gun. The anti's have wrongfully but very effectively used military designations to give standard semiautomatic rifles a false sense of unnecessary evil. Using AW is bad enough but SAW is well over the top for AR-15s.
BTW, Bill Ruger had a history of pushing for magazine limits and rifle bans. He did this by his own public words... "to preserve the gun industry" but when, true in fact, he was trying to preserve Ruger, Inc. profits from competition.
At one time, Ruger was king with their .357mag and 44mag revolvers (Dirty Harry Movie) and the 10/22 and mini-14. They were the "King of the Hill" to speak. However, as the 80's became to close, the 9mm semi-automatic handgun's popularity and the AK/AR rifles began to hurt Ruger's sales. Customers were no longer interested in buy revolvers, they wanted semi-automatic handguns. The younger generation wanted AKs and ARs over 10/22s and mini-14s.
Ruger had a real serious problem and was having financial difficulties. They countered by producing a line of semi-automatic handguns but these did not sell well (probalby due to the mediocre reviews in magazines where Ruger heavily advertises). So what to do? Well, Bill decided that legislation banning the competition would do. He pushed for magazine limits that would hurt semi-automatic handgun sales and bring shooters back to revolvers (or so he thought). He also pushed for AK and AR bans.
He was a very selfish man who stopped believing in the Bill of Rights. Profits became his greed. May the SOB rest peacefully in 7734.