Springfield Armory introduced its LevAR; basically an AR charging handle with a fold-out right hand side contact surface to provide additional leverage. They claim it's for out-of-spec or substandard ammo (I'm looking at you Tula) that gets jammed in the chamber. Specifically, the honking lever allows you to go beast mode on the charging handle instead of mortaring your AR to clear a jammed cartridge.
In my experience, this would never help me. Mortaring and simply firmly grabbing a decent aftermarket charging handle has worked or nothing would. Maybe if you don't have a nice AM handle with ambi or larger contact surfaces you might have an issue from time to time. Stoner and Sullivan's original handle isn't that great, but if they felt the gun needed this (along with the forward assist) they would have designed it that way.
Thankfully, the Biden Administration cares a lot about shooters and recently banned Russian export ammo, meaning cheap, crappy steel cased Tula ammo is not long for our shelves. I've only experienced catastrophic jams I couldn't clear in the field with Tula (which I have forsaken shooting from an AR platform forever). Twice (I know, I know), I needed a 5mm rod, oil, and heating the chamber to bash the stuck case from the chamber by inserting the rod down the muzzle and banging away. The issue was that the extractor just couldn't hang on to the case. And if the extractor can't hold on, all the leverage in the world ain't gonna help.
Anyhow, this is a solution in search of problem. If I were a millionaire, I'd buy one for the collection simply because the engineering is cool.
Clayton E. Cramer
Gun Free Zone
The War on Guns
The View From Out West