its call a hang check,
ok, try this.... (make sure the weapon is unloaded before doing anything!!!!!!!!!!!!!!!) not saying your dumb, just needs to be said...
lock the slide back with the slide stop....
Turn the gun with the barrel facing veritcal...
wrap your hand around the barrel.... I use my thumb and index finger...
release the slide stop...
ride the silde all the way down with the resistance from your hand...
what your trying to see is, when the recoil spring is un-sprung, that slide return fully into battery...
Becareful not to pinch your hand, but give the slide enough resistance to make the spring push it into battery, not with the weight of slide going forward and the natural caming action....
if that makes since....I hope,
the other way involves a pencil and vice, so try this first.....
what happens is once the recoil spring gets a few rounds on it and you get dirt and crap build up in the gun, if it is hanging, the gun fails to return to battery and you have a stage 1 mal. I have seen three so far that do it, and all Remington R1's, I thought for a while it was the lower lugs, then the bushing, but as it turns out its the upper locking lug interface between the barrel and slide. simple fix, just seeing if its a bad lot, of complete F-up!
Thanks,
A