Reason to have that is because you are stupid.... Actually its legal barrel length, being minimum of 16 inches IIRC, and why would you not want a real barrel and rifling that whole distance, why shortchange yourself?
If an NFA weapon, then I could see the shortness but would not add a 6 inch long hider to it...
Just my take on it, its purely a bling thing and you see that too often on ARs, like the quad rail float tubes... dang...
You stumbled into a good deal if the build(s) are good you'll be really happy.
Consider money wise, that while an AR15 will never be the same power as an AR10 platform, don't forget that uppers for the AR15 in 6.8 spc, 7x62x39, 458 socom, 50 beowufl, 450 marlin and such, and other wildcast, give the 15 versatility that won't end. Including a 22 lr upper.
That being said I own my first AR10 lower and its destined for a 260 AI and either 338 Federal or 358 Win at some point in the future....
