i haven't heard of anyone doing that to the newest version
supposedly, the end caps spread the tube and contribute to standoff tightness around the tube
i'd be afraid to remove the cap and any hole large enough to put the foam can's tube into might weaken the cap to where it would lose its rigidity and no longer push against the tube enough to stay in place and do its job
you can't shoot foam through a pinhole
you might know all this, but just putting out there how those caps are supposed to work in case someone not aware starts prying on them without a little info