How to covert full length AR-15 to carbine length?
It has a fixed front sight about 6.5in away from the end of the muzzle brake. I see the gas tube begin about 8.5in from the end of the muzzle brake (the front sight being 2in wide). The visible portion of the gas tube is 11.5in from the front sight to the delta ring.
I would just get a new carbine, but they're all currently sold out and being price gouged anyway.