TACKLEMAN24
New member
I recently aquired a nice m4 carbine at a gun show. I did not measure it at the show but it appeared to be a 16 inch barrel. However after getting it home and cleaning it I noticed that the barrel ends an inch into the very long flash hider. Measuring from the chamber to the end of the flash hider it only measures 15 inches but measuring from the chamber to the actual end of the barrel (inside the long flash hider) it only mesures about 10 1/2 inches. Now my question is am I correct in assuming that this is actually illegal without the tax stamp from the ATF letting me legally own short barrelled longarms. I am almost thinking that this M4 actually started out as AR pistol that for some reason someone decided to convert over to a rifle.