Well, not being an infanteer they're not giving me one, so I haven't shot it all that much, but realisitically not so much as you'd notice. An inch and a half of barrel won't make that much difference in the hands of most shooters, they can't shoot nearly as well as the weapon anyways.
They're used pretty much exclusively with optics (mostly the EOTech 552 but I've seen a few that still have Elcans), but even if they weren't there's still no more distance between the front and rear sights than on an M4.
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