So, at the time that this card is coming out, we don't know a whole lot about what Borealis will look like as a whole. We don't know what other Killers will be in there, we only know one sentry (Anemone) and we don't know if there's anything waiting in the wings to play with the "weapon" subtyping on this, which is purely flavor at the moment of this writing.
What we do know is that, at this moment, there is one Gold Standard killer, also in Crim (the home of great Killers), by which all others must be judged. Bukhgalter - it's efficient, reasonably costed to get down, and much like Discover™, it's the Card that Pays You Back! So how, indeed, do these two cards compare?
Based on the pure numbers of how much it costs to break a given sentry with both cards operating on their own best lone potential... Revolver holds up really well, actually. Against all but 2 Sentries in the current Startup format, Revolver is equal or cheaper on credits when compared to Bukhgalter. In some cases, it's much cheaper - if you find yourself facing down a Tyr or an Archer, you'd probably rather pay 4 than 7 to get through them unharmed. And for the 2 exceptions - Swordsman and Anemone - well, first off, I'm not sure anyone has run Swordsman for years, but more importantly, each of them cost 2 to Bukhgalter's 0. Not nothing, but not the biggest downside either.
The real conversation between these two is a little more about incomparable traits. Bukhgalter's downsides are that it costs one more to install than Revolver, it costs more influence to import it, you're getting a rebate rather than a discount with it, meaning you still need to have cash on hand, and the rebate only works once per turn. Revolver's downsides are that it breaks 7 subs, total, and with that seventh sub (already known as "throwing the gun at them") it trashes.
The truth is that in an ideal game, you'd probably want to have both of these out, but that scenario is unlikely until Glacier makes a big comeback. decks that are likely to hit one sentry per turn are still going to be better off with Bukhgalter. Decks that like to make a LOT of runs in one turn will prefer Revolver. As a result, this card might end up seeing more play in Shaper than in Crim, especially with Deep Dive encouraging the Big Turn playstyle and having Simulchips and Harmony AR Therapy in-house.