I am using a stock Del-Ton ECHO 316H with CMMG conversion w/Vortex StrikeFire II. Using CCI AR Tactical ammo the gun has been nearly flawless. I think I have only had one malfunction in 4 matches. I know the last two matches of 11 stages have been completely flawless. I can only remember ever pulling the charge handle once in a string in a match. Practice with various other types of ammo is a crap shoot however.
NOTE: I did replace the 9" hand guard with a 12" Also has an SJC Titan Comp/Brake on it.