I don't hear about the reliability issues with the latest serbu semi's.
The CQ is a great rifle, but your stuck with a short + very noisy barrel, unless you have a longer barreled upper fit to your lower.
You can have another barrel of choice made for the serbu, by the barrel block, armorers tool and switch barrels.
I had a 29" lothar walther match chambered barrel made for mine. With the set trigger Match lower, Match Ammo fit to mag length, the combo is super accurate.
The Serbu is in a whole different class as far as aesthetics and function.
The serbu bolt movement is smooth and fluid. It has a buffer system in the stock too. Recoil is very tolerable.
The barrett is a workhorse. Smooth isn't there and the dual springs make a distinct noise you get used to, and it works.
It also breaks down for easier travel.
SJC