LMT Bullet button removal

[Okami]

Trying to get my rifle set up to featureless (remove the damn bullet button).
I've tried heat, bullet button tools, ect with no luck.
I started to drill the mag release (opposite side) and stopped as I don't want to booger it up since I don't have a drill press to get it centered right.

Either I need to find a local gunsmith (Inland Empire) or what suggestions do you all have? I've had other firearms with bullet buttons (no problems removing), but this one is an absolute pain.

Thanks

[ar15barrels]

They are loctited.
Drilling the magazine catch is the way I do it.

[Okami]

Thanks