I thought that was the reason for the metal sleeve on the end of the Silca Impero pumps.
The anti-grizzly bear mace is said to be pretty long range -- 30 feet -- but does have problems with wind. Might have to stop to get a good shot off.
http://www.counterassault.com/
Adds new meaning to "the devil take the hindmost"
-- Joel Niemi / Snohomish, Washington // about to go backpacking in Glacier
National Park, with my little cannister of bear spray on my belt