Just as very few people could pick up Vincent's sword with any chance of actually wielding the thing, there are very few people who could pretend to use this particular Enclave as the in-arm weapon that it has been retrofitted to be. Irahl has certainly never gotten to see it.

So, for the short bit of time that Vincent is pretending, Irahl muses over the sight.

"Yeah, shame. You'd make a good sniper."

Which is maybe an odd thing to say, given that he has absolutely no knowledge one way or the other of Vincent's skill with firearms, or any of the other things that would actually go into making a good sniper. He's not really thinking about this particular fact when he makes his comment.