Hex key?

[CalifEd]

Yes, the 3/32 worked well on the rail (I Thank you for that) & at first glance it looked good for the front sight, however it is just a little loose, it will just barley grab. I'm thinking a metric might fill the bill. I salute you for your service!

Years ago, way before Torx bits, Sears had small sized hex sets in both standard and metric.
Served me well for years until my son decided they were useful for something or other and they went missing.

I bought a Brownells starter set of removable tips and add specific sets as I go along.
To some it may appear that I have duplicates but some gun manufactures' have a very specific slot/screw size and close enough is not good enough.

[RTE]

Buy a SET of T-handles...