Always ready to recommend the Bushmaster Dissipator...
A3 flat-top with full front sight.
Optional A3 removeable carry handle with sight.
Hogue grip & forend kit with a swivel stud installed.
New teleSTYLE stock installed.
Redi-Mag extra magazine carrier installed.
I recommend the clean bbl. end for the reason of being able to clean the crown of the muzzle, but, if you must have a muzzle blast enhancer on the end of the bbl., the AK style is a good one.
Bushmaster will charge for the parts, but, the installation is free. This rifle would be very versatile in this configuration. Sights or optics; free floating bbl.; pre-ban look; fairly light and handy; etc.
THEN AGAIN, THE AR15.COM VERSION IS A HELLUVA DEAL AND WOULD BE ANOTHER EXCELLENT OPTION...
Lots of options could be added later.