I know I may get flamed over this advice, but here goes:
Take those screws and loc-tite them in. (Now here come the flames) Using a Dremel tool, GENTLY grind the heads down. Before inserting the screws, use tape as a barrel protector. When the grinder hits the tape, that is deep enough. Use a cold blue to color the screws.
"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)