These are the drill bits I use for drilling gas ports. These will fit into the port and it will guide the drill. Just press the gas block on first. This works on the Romanian, Polish, Egyptian, Russian, and AMD65 style gas blocks.
The Bulgarian 74 gas port holes are smaller and need a shorter drill bit.
Size: 0.1285 In.
Flute Length: 1-5/8"
Overall Length: 6"
Point AngleÂ°: 135
Fast shipping. Looks good
Works great, tried other bits but most are useless, this is the best drill bit yet, I only buy from AOA from now on
This drill bit surprised me. Even on an angle it cut right in.