Wasn't this in the gunsmithing section? Have you considered purchasing another slide? On the trigger guard, look at using JB weld. It can be shaped into the correct form, then painted with dura-coat.
"A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed."
Life Member NRA
Life Member NAHC
Former President of the ECPT (Eifel Combat Pistol Team)