You could just tighten castel nut,or if you got a spring loaded center punch or any center punch hit the threads once to keep the nut from backing off.That's for collapsable stocks,A2 has a screw at the end of butstock with blue thread locker.
Outfukinstanding,note to self "great retirement gift" ;).I like the way it shot from standing position and the way it cleared right shoulder of lefthand shooter <thumbsup> GO ARMY. <thumbsup> <thumbsup>
http://www.model1sales.com/ http://www.rguns.net/rifles/rifles-semiauto-ar15-uppers-556-16-profile.shtml These are the biggest selections I have found brother. <dontknow>