Hey, at least he tries:

Paul Helmke, President of the Brady Campaign to Prevent Gun Violence: Automatics are banned, but when you're able to buy a semi-automatic, that can take a clip with 33 rounds...and, um, I'm not sure yet if they've determined how many rounds were in the clip this individual had, but ...

Carlson: Just so you know, there is no, there is no clip for a handgun that holds 33 rounds. 

Helmke: Well, yes there is. I just checked online this morning and they advertise for a clip for this gun, for thirty dollars, over the internet, so...it's, it's, when we had the assault weapons ban, you banned clips with over ten rounds...

Carlson: Just so, just so you know, a Glock, there is, okay, there is no, that is factually untrue.

Glad to know that Tucker Carlson, who obviously would never contradict an expert he invited on his show unless he was absolutely certain that he was right, is so well versed in what fine products are available for Glock pistols.

Except for one teensy little problem--from, of all places, Glock.com (who'd have thought?):

Like no other pistol, GLOCK pistols permit almost unrestricted compatibility of the magazines within a caliber. Standard magazines, for instance, can also be used for backup weapons. Compact and subcompact GLOCK pistol model magazines can be loaded with a convincing number of rounds – i.e. GLOCK 26: up to 33 rounds.

Wait, a Republican pundit using an authoritative tone shot off at the mouth on an issue where he clearly has no expertise, directly contradicting an activist from the other side who was factually correct?

Nah, too implausible.  Someone who sounds as certain about something as Carlson did must be right. 

Right?