Loctite 410 is used to bind flattop sight rails to the body

Gumby very kindly provided this print which dimensions the barrel threads used on ATS guns.

I've converted the ATS instructional video into a pair of Quicktime files (Quicktime 5 Viewer should be able to open them).  Each file is pretty big (~80 meg for the first, ~71 meg for the second), and is around 10 minutes long.  Many thanks to ATS for allowing me to post these!

ATS video part 1

ATS video part 2

Disclaimer: I am not affiliated in any official capacity with A.T. Systems.  The above videos were produced by them and I simply converted them into a digital format.