Mine is the 16 inch rifle. Had it about a year with Dictator adjustable gas block ,Vortex Strike Eagle 3x20, SureFire muzzle brake and SureFire suppressor. Completely reliable except for occasional ammo brand change requiring gas block adjustment, but that takes 30seconds.
It likes Magpul and Lancer mags, both 20and 25 rounds fully loaded My hands aren't that steady, but it is a sub MOA gun, on occasion. Problem is the shooter or the ammo, not the rifle. This is a tactical gun for me.
Currently using GG&G range ammo and Speer Gold Dot 150 gr for when impact matters. Have some Winchester Deer Slayer XP 175 gr on order. Its bullet supposedly makes huge wound channels. If it shoots well it may be my choice for longer distances.
This is my truck ( gets heavy
cable locked when I am in store) and SHTF weapon of choice. I have spare parts , but want a spare bolt, as that is where the stress is.
Extremely happy with this choice!