Beretta cx4, have had it for years. Grip fed magazines and pistol controls. Reloads are just like a pistol. For some one without extensive time with an ar, all the controls are in the correct spot.
18 round magazines, factory 30rd and an after market 32 that fits 34rounds.
since it is a pistol style receiver it is naturaly shorter than a rifle format without going to the hassle of a sbr.
I have a 9mm ar and a scorpian. Still shoot faster with the cx4. Could be I've had it the longest.