Re: How common are "slamfires"?
i expect that the vast majority of batfe agents us common sense when matters like this are concerned. but i also imagine that some of the agents use their power to undermine law abiding citizens rights. there are probably cases where the batfe prosecuted someone for having a slam fire. or for having a paper clip/shoe lace too close to their receiver. however i expect that these cases are very rare. that doesnt make them right though.
my honest opinion is that the government, including local law enforcement has too much power and that a person should be "allowed" to have any type of gun they wanted.
remember jack weaver? ruby ridge? weaver was somewhat a shady character however by merely cutting a shotgun barrel down 1/8 of an inch he did not commit a crime by anyone's standard except the government or perhaps some liberal.
and should jack have had a better mindset, and been better prepared... even with a few dozen like minded friends, he might have been the pinnacle for a new movement in the gun rights world.
where it stands though, the batfe sees 18" legal for a shotgun barrel and 17 7/8" illegal. which in my opinion is bullcrap and is reason enough for the american people to fight for their gun rights.