From The Trainer comes this tip.
I've started using this stuff on my field gear when it breaks down. It's very, very good and actually does what it advertises.
J-B Weld: http://www.jbweld.net/products/index.php
They've got several products; I've used only their standard 2 part kit, but it works like a champ! The only draw back is the time required to fully cure (about 15 hours), but they do offer a 'quick set' type.
This could be used for stock repair, LBE buckles, etc.
Very light, very small, and the ROI for the little space and weight it adds is phenomenal!