Allens are the way to go. If you don't want to try the extractors, especially on the small mag cover bolts you can use a drill bit the same size as the screw. When you get through the head it will pop off, then you just remove the cover and remove the screws with a pair of pliers. The only reason I offer this approach is that the extractors are very brittle so if you are not use to using them you may break it off in the screw. They are super hard so once broken off further drilling becomes a nightmare.