I've been using HFT's Threadlocker No.22 on my Buckmarks for several months now.
In my opinion, it is ideal for holding the top rail screws after take-down for the best access to the pistol for cleaning!
It allows me to replace the screws without much tightening torque so that I am
much less likely to strip the
aluminum-frame-threads when they are joined by
steel-screw-threads.
And the stuff holds the screws from turning when you don't want them to turn (while shooting), yet they are loosened rather easily when you DO want them to turn.
Just use a
small amount near the end of the screw so that the Threadlocker No.22 isn't pushed out of the screw hole and forced under the rail when you are putting the screws back on. I did this mistake the first time and, while I was able to peel the rail up and off, I was sure glad I used the weakest stuff instead of blue locktite (or Red! - SHUDDER!!).
I had to clean off the stuff that came up under the rail too!
I use it each time I clean my Buckmarks now. I think you'll like it.
RonJon