Some of them are really tight but others slip off like the proverbial well worn sea-boot. Turn a short stubby nickel or hard stepped brass bar. 1st part slips into the barrel and the larger dia slips inside the flash eliminator but seats ON the exposed barrel face you can just see inside the throat.
Put barrel between blocks in the hydro or fly press and let it hang down, supported by the extended top (foresight) and lower (bayonet) areas. Load up press and it'll creak and groan and then just slide off. I suppose you could theoretically heat it up a tad if the mood took you but there's drawbacks to that.