Small metal airsoft part

[corkcnc]

With respect to Blackrat, I wouldn't TIG as there is too much heat going into a small part, you are just asking for distortion, but maybe Blackrat is just a much better welder than me :). I would agree with Nick and 3axis mill. I wouldn't use angle or box section though as they are extruded from a gummier aluminium, go with a block of 6082 T6, the part is small so material will be cheap. Nothing too technical in the drawing though so someone local should be able to sort you out. Start with a block, mill with the "from left" view facing up, saw off, flip and skim to 2.7mm.Might need a basic jig though to prevent chatter by picking up on the hole.
Best of luck with it.
On an aside I think you should rename "Front View" as "Back View" for the left/right to be correct. I'm not trying to be a pedantic ass but it's important to prevent ambiguity if you send the part to someone for machining. (But I could be wrong, it might be some 1st/3rd angle thing I missed)
Rgds,
Noel.