Originally Posted by
jbjh
My guess; For 10.5 and longer, they grab a carbine barrel out of the stack and cut it down. Under 10.5", they probably have to contour their own blanks. It might not be worth profiling the rest of the barrel. They just make the whole thing .750 and be done with it. Less machining=more profit.
That's exactly what I was thinking - just put a chamber, muzzle threads, and a gas block journal on the blank and sell it. Side benefit is more thermal soaking capable mass (since historically AR pistols were range toys more than practical items - I'd still argue that in 5.56 anything under 10" is either a tiny niche or novelty item) which means they can be more fun to dump large quantities of cheap ammo through them.
I've seen some more reasonable profiles on a lot of the 300BLK/300WHSP options in the 7-10" range, but that's actually in the range where those projectiles perform out to 100yd at those muzzle velocities - so in BLK (especially with a can) I'd actually look for a smart implementation of a medium/tapered contour setup, or if it's without a can (compact/packable AR Pistol - especially with 20rd or limited # of mags), then I'd go for a lightweight setup.
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