forgive me for the ignorance.... but how are any of those non-restricted?
These firearms are non-restricted because they do not meet the definition of a restricted firearm.
my main point being that the tavor is probably just as short as a p90 (which to my knowledge is restricted),
Your main point is wrong. Comparing one firearm to another, unrelated firearm (Well, both look black and scary and both are bullpup but this is where the similarity ends) is not only wrong, but is a favorite tactic of antis. Are you an anti or just trolling?
I'll explain why you are wrong, but in the future please research the topic before making statements like this, and if you have any questions, do not hesitate calling CFC and asking (ask to speak to firearm technicians in Ottawa, extension 1090, these guys are paid to explain this).
Tavor is available as both restricted and non-restricted by virtue of a barrel length. Since Tavor is not available in non-bullpup configuration it can't be prohibited based on that. Since its receiver is designed for semi-automatic operation only, it can't be prohibited based on that. Since it is longer then 26" it can't be prohibited based on that. Since it's method of operation is not based on any of the restricted or prohibited firearms, it can't be restricted or prohibited based on that.
Tavor exists with barrel length of 18.6" making it non-restricted, and in shorter barrel length for people who enjoy using it at the range only. In a latter case, one can replace the barrel with a longer one, making the firearm non-restricted.
P90 is a fully automatic firearm with short barrel (8" if I recall correctly) that is not available in Canada (or US) to civilian customers, but it's semi-automatic cousin, PS90, is. Looks the same, but only operates in semi-automatic mode and has 16" barrel.
Further, PS90 only meets definition of a restricted firearm on barrel length only. Again, replacing the barrel on a PS90 with a longer barrel will result in a non-restricted firearm. And yes, people do that.
the XCR is an AR variant (i thought all of those were restricted as well)
This is where Alex Robinson, owner of Robinson Armaments will start hating you. For years Robarm is trying to prove that XCR is not only based on Stoker 63 design, but is actually better then AR-15, and here you make this statement. Please, do some research before talking.
Once again, the same thought process as for Tavor applies - is there a reason to prohibit XCR? And no, RCMP felt that XCR doesn't meet the definition of a restricted or prohibited firearm, and thus is non-restricted.
Further, the only XCRs officially imported into Canada are available with 18.6" barrels, so there are no restricted XCRs in Canada unless they are grey market caliber conversion kits.
and the FS2000 is one mean looking rifle and would most likely be restricted as well...
So looks is what you base your decision on? Not on barrel length? Not on action? FS2000 is restricted on barrel length only, not on anything else, and can be re-barreled to no-longer meet definition of a restricted firearms. Certain dealers (Kodiak Outpost for one) do that before selling you the firearm, if you request it, so you receive a non-restricted firearm right from the dealer.
Your thought is unwelcome, since it's wrong and spreads fear, uncertainty and misinformation. In the future, please educate yourself before making blanket statements.