Looking at the barrel profile and forward assist knob, I *think* those are surplus M16A1 with round handguards, and thus capable of fully automatic fire.
Given their well worn appearance, it's very unlikely they are semiauto AR15 SP1.
60 posted on 04/16/2005 10:14:37 AM PDT by xsrdx
(Diligentia, Vis, Celeritas)