My friend just bought a used m4 . The gun has the collapsible stock , 7 round tube and night sights , along with aftermarket hand guards and some other incidental after market small parts The gun has no box, but he was told it was an LE model. His concern is 922r compliance . In the absence of a box to tell you the proper configuration, does Benelli have a website where you can look up the serial number to find out the original model number? Or would you just call them , and if so , would that information be obtainable from the serial number ? Thanks .