Obviously, quite a number of M4 owners are adding the full-length tubes that the M4 was designed for - but isn't there some concern about legalities? What if the owner's M4 was used to protect the family and a LEO noticed the full-length magazine tube? Or what if, in this scenario of the M4 being used to protect a family and the perp was wounded and sues the person because the M4 did not meet BATF standards?
Yep--I want an extended tube, but the legal concerns override the practical concerns...
MikeSp