Our Integral Muzzle Device barrels measure 16 inches overall in accordance with all BATF requirements. There are no threads since the muzzle device is machined on to the barrel during the manufacturing process giving you a one piece 16" overall AR-15 barrel.
There are two SKUs of integral muzzle brake barrels in 5.56:
15A58M16NGQ-IMDB: Gunner profile
15A58M16NPQ-IMDB: Pencil profile
We recommend a 13" long handguard for this barrel. This will leave ~.5" of barrel between the end of the handguard and the start of the muzzle brake.
The Faxon Firearms AR15 Barrel is 16" in length without the included muzzle brake.
The Faxon Firearms AR15 Barrel with Integral Muzzle Brake will work with a variety of handguards and a standard AR15 barrel nut.
Yes, this barrel should work with the Aero EPC 9 receiver and BCG
These appear to be typos in the description. Both the barrel shown and the SKU are the muzzle brake version of the Integral Muzzle Device barrels.