Originally Posted by unclebob
It would only be allowed in unlimited.
Aftermarket "beavertails" are
allowed in the "stock" categories with Gen-3's & prior, so long as they are not wildly
different from the Glock-produced beavertails available for the Gen4's.
You will not find it in the current rules. The 2013 rules are pretty much a repeat of the 2012 rules and that particular change did not get in there.
But it is true. Check with the GSSF RangeMasters at whatever rmatch you attend.