Carbine tool

Here are pictures of a wrench for gas piston nut, at least I think it is, it fits.

I should have put a ruler in the picture, but it is 5.5" long. Fairly rough forging.

Has a stamp, hard to tell what it is, appears as an "X" or something close. No ordinance marks.

Any ideas or definite answers?

Could be a K for Kingsbury tool mfg. who made them.

Scott

The K is located in a different position on the tool. This is an X , which was Hadley Specialty Tool, in Mass.