Not completely true. The 205 gun/bow are the same physical damage as 210 gun/bow. Luckily for bards, the relic bow is really good with crit/det since the other two 210 weapons weren't crit/det. The gun, however... Heavensfire is 93 crit/68 det, but the Armageddon is 97 det/71 skill speed. So unless skill speed is actually better for machinist than other jobs despite rapid fire on 3 shots every 90 seconds and all of the ogcd skills that aren't affected by skill speed at all, it's unlikely that the +4 dex on Armageddon will make up for the better secondary stats on Heavensfire. At best they'd be roughly the same and probably not worth the grind and gil unless you really like the glamour.
We'll be able to upgrade the weapon further later, but I'd rather just do a different weapon now and work on this part of the gun when the difficulty is eased with a future patch. :(
