Is a 10.3" barel not enough?
But even a 14 1/2" bbl on a rifle is legal, right? I understand there is some debate about what constitutes the real difference between a SBR and a pistol, so is this the basis for some of the confusion between a SBR and a rifle caliber pistol?
So if I'm understanding it correctly, most if not all bbl's are already at a given length when you buy it, and you order it accordingly. It's not something you would typically 'cut to length' from a longer stock length to do your build????
I doubt many " Builders" are cutting down their barrels. They're mostly buying uppers in whatever barrel length they want. As far as the ATF is concerned, a flash hider that's pinned and welded counts as barrel length so a lot of 16" barrels are actually 14.5" barrels with a muzzle device permanently attached to it.
I fall squarely into this category. I have only "built" a few AR's, but the process involved the entire upper assemblies being purchased as one finished piece. I typically also buy a complete lower, but may change out some of the individual components. Aside from adding sights or optics, 90% of my "build" process is just fastening the upper to the lower with two pins.