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[The_Quatermaster_Rifleman]

I didn't mean to offend you, I'm from the "build to the mission" school of thought. That's reason I asked. What is the mission of the rifle you're building? I'm curious about our reasoning behind choosing such a short barrel. Learning your reasoning increases my knowledge base, and could be that by sounding off, you may notice there might be other choices better suited for the mission of your rifle.
My question is for exchanging knowledge, no need to get defensive, you are not under attack.

Plethora of reasons. But saying a do all master of none jack of all trades will suffice as a good short and sweet explanation.

However, if you want a wall of text in explanation...

When you want a GOAT that can be used to clear your home of any invasion my methheads but still being able to nail the bad guy 300 yards out with a scope to do PID with. My 11.5 SBR with red dot is in 5.56 and small, maneuverable, and easy to use. However do the Scrambler at Gunsite and see if your home defense rifle with a dot is optimal past indoors minute of man when the targets are earth tone meaning camouflaged. I could put a prism ACOG on it but the eye relief is fixed. I could run a dot on top but it's too tall for me. I could use a magnifier but then I may as well have an LPVO there then. Offsets are meh and only really work if your position is wonky. But you'd still have to get a precise zero from it at an offset angle in order to get there. No thank you. An LPVO is heavy, too heavy for the HD role and that's just my opinion here. However I can make a compromise by having a companion upper to my normal 5.56 SBR in the recce format should the need arise for it. It's called being able to adaptable and taking advantage of a modular rifle system. I may even do a third upper, in 300 BO.

Plus by being able to swap to 6 ARC when I need a bit more punch, that means I can leave the AR10 at home and have something that can be used for almost any situation that's defensive in nature. Which in turn means that I can use gear that already works with the magazine footprint instead of having to get another placard and another well equipped belt that's just for 308.