m14 castle nut lock screw

[cub45]

what is the size of the hex wrench for the lock screw of the castle nut?
thanks kurt

[Larry Gibson]

Originals were metric.....so a 15mm should fit.

Sometimes a 1/16 many times fits.

[cub45]

thanks for the reply, this is for a norinco rifle with what I think is a US flash hider, took the screw out with the 1/16 wrench ,but not right size, to loose but cant find the right size to put it back correctly.

thanks
kurt

[leebuilder]

Get a new set screw the one I had was so soft it wouldn't take a retorqueing.
Can't remember the size, since removed it.

[historicfirearms]

My Norinco had a soft set screw as well. I have to baby it taking it in and out. Some day I will have to get a new one