Thread: Remove loctite-fastened howa superlite rail?

My guess is they were using an Allen key insert that you would fit to those hex screwdrivers. They can be brittle.
I've broken a small torx before trying to get a rounded cap screw before.
Proper Allan keys just either round off them selves or the screw/bolt.
As has mentioned heat is the key.
Soldering iron or even possibly heat up a small diameter of welding rod with a gas torch then hold it on the screws.
Get a good new proper Alan wrench/key and have at it