Broom Rider, I read an article by Brian Pearce that I'm pretty sure listed the 629-3 as a full endurance package gun. I got out my 629-3 Mountain Gun and it appeared to have all of the upgrades he mentioned, which I believe was a radius stud package, a internal locking mechanism to prevent unlocking, and a hardened crane, (can't tell by looking at the last one). Am I wrong?