Nice picture. I hope Kahr will do something for you. I wouldn't want to put a lot of money in it and might consider a really good epoxy fix. I would even consider drilling a small hole to insert epoxy to strengthen that area, if you decide to take things into your own hands.
Good luck.
Wynn
USAF Retired '88, NRA Life Member. Wife USAF Retired '96
Avatar: Wynn re-enlists his wife Desiree, circa 1988 Loring AFB, ME. 42nd BMW, Heavy (SAC) B-52G's
Frédéric Bastiat’s essay, The Law: http://mises.org/books/thelaw.pdf
Thomas Jefferson said
“A government big enough to give you everything you want, is strong enough to take everything you have.”
and
"Peace is that brief glorious moment in history when everybody stands around reloading".