AR doesn't mean Armalite, Armalite is a type of AR produced for the Millitary by the company Armalite which was sold to colt. so if AR did mean Armalite, it has the significance of the 'B' in B737-900 (Boeing 737-900)
I believe he is right about the "ar" part being used as a designation like how they put "B" for Boeing. I think he just doesn't realize they were a real company, since they went out of business in 1980, I think. Though I did hear someone is using their name again.
Oh he's right about that, but it still ment "Armalite Rifle-15" "Armalite Rifle-10" and so on. It was a designation, a designation that used "Armalite Rifle" as the prefix.
Psst, I have an original Armalite AR-15, lol.
I don't shoot it very often, but seeing as I'm going up to my cabin for the weekend for shooting and fishing, and you reminding me about it...I think I'll bring it along, lol.
[spoiler]hate to break it to you but that's exactly what AR means; Armalite Rifle. the AR-15 isn't the only model of AR around. there is the AR-7, which is a .22 caliber survival rifle developed for crashed pilots as a last ditch effort to survive wilderness until recovery.
they are still made to this day by a different company.
there is also the [url=https://en.wikipedia.org/wiki/AR-18]AR-18[/url], of which there is a metric feckton of operating system clones, famous ones you may have heard of are the FN SCAR platform or AR-180.
there is also the older design, the [url=https://en.wikipedia.org/wiki/AR-10]AR-10[/url] chambered for 7.62x51mm(.308), though modern versions can be a variety of calibers.
there was also the AR-50 for a while, which was a bolt action .50bmg upper half conversion for AR-15s that spectacularly failed, killing/maiming a few users as the bolt exploded into their necks.
assault rifle and battle rifle are NATO terms determined by length and caliber, as well as the ability to have selective fire modes[/spoiler]