Originally posted by AGD
It can get a lot more worn out before it starts really causing problems. I am just afraid some father will call me complaining his son just bought the thing with his last dollar and now it's falling apart. See what I mean?

AGD
Dunno how feasible it'd be, but how about a thin metal jacket on the outside of the delrin sleeve? It'd serve as a 'sacrificial' wear surface while still having most of the weight advantage of the 'pure' delrin sleeve? Sort of like an aluminum honeycomb panel. Strong but light.

Or...instead of a metal sleeve around the delrin, have a few metal rails along the length of the bolt to take the wear and tear? Same advantage of a metal sleeve, but it'd keep even more of the weight savings of the pure delrin sleeve. It'd kinda look like one of those 'Crossfire' barrels. Except with delrin inbetween the rails of course.

Though I imagine that that either idea might have some tough manufacturing problems.