front sights

Wats up! Just got an m1A scout, and she's a beast. Got some quick questions though. So Im trying to zero my sights and Im running into issues with the front sight. Every instruction manual I've read says that I need to be using a 3/16 allan wrench. This is clearly not true as the closest size...

Hello, my m1a did not come with front sights, there are indentions in the barrel where something seems to been mounted before, but were removed. SO I got me some front sights off ebay, I assume I need a screw on front base but so far have not had any luck in finding said base. Any ideas...