If the barrel is a big heat sink, how is it going to get too hot for Loctite?
Your original idea should work with something like this, maybe.
http://na.henkel-adhesives.com/adhesives/product-search-1554.htm?nodeid=8797948444673
Your original idea should work with something like this, maybe.
http://na.henkel-adhesives.com/adhesives/product-search-1554.htm?nodeid=8797948444673