it's a good point, if you're going with a 12."5 barrel most muzzle devices make it close to 15". My SR-15 is a 14.5 pinned to 16" and I don't notice much of a difference between that and my Non-NFA in side by sides. Biggest difference objectively is the rifle would have to be made compliant to NJ's AWB.
Biggest difference is I can run a suppressor on the Noveske when I'm with friends in free states who have cans, I can't do that with my Knight's unless I swap out the brake for another suppressor ready brake. It's also nice to run a flash hider on the Noveske, brakes on 5.56 are a bit overkill. I had a surefire brake on my Noveske until recently and the concussion drove me nuts.
depends where you buy. When I bought my LWRC rifle I paid $2000 from Luciano's in Lodi. RTSP, Ottomanelli and a few other well known retailers wanted $2700-2900 for the same gun.
Here's an updated version of mine, I put an SBA4 on.
Noveske Gen 1 Lower
Noveske Gen 1 complete upper 12.5" Barrel, NSR-11 rail, SiCo ASR 3 Prong
Radian Raptor Charging Handle
Geissele G2S trigger
Reptilia CQG grip
LWRC Skirmish sights
Trijicon MRO w/Geissele Mount.
Without optic I spend $1500 on this build.