Buttstock question

[lysander]

Learned something new today. Had always assumed it was the swipe stick version of Loctite.

You were both sort of right the first time. At least for Colt screws, made per the drawing.

It's a Nylock brand medium strength thread locker, pre-applied to the threads, not the usual nylon button inserted in the threads-type nylock fastener.

Other brands may use other type pre-applied threadlockers.