"...does not take into account the very likely increase in future long gun deaths due to the increased availability..." When will that kick in? There are about as many rifles as there are handguns. Long guns (rifles and shotguns) account for almost twice the number of handguns.
"We have not as yet hit critical mass for long gun distribution to the degree that hand guns have..." Please explain your metaphor and add a dash of quantitative to that stew.
"Of course the measure of collateral damage has not yet been applied, in law or in sales." How is a "measure of collateral damage" which hasn't occurred applied? Is this just a statement meaning that the future hasn't yet become the past?
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http://www.gunpolicy.org/firearms/region/united-states
Number of Privately Owned Firearms
The estimated total number of guns (both licit and illicit) held by civilians in the United States is 270,000,000 to 310,000,000
Rate of Civilian Firearm Possession per 100 Population
The estimated rate of private gun ownership (both licit and illicit) in the United States is 101.05 firearms per 100 people
Number of Privately Owned Rifles
In the United States, the number of rifles in civilian possession is reported to be 110,000,000
Number of Privately Owned Shotguns
In the United States, the number of shotguns in civilian possession is reported to be 86,000,000
Number of Privately Owned Handguns
In the United States, the number of handguns in civilian possession is reported to be 114,000,000