i think i know what it was guys, i did a little inspection and i took the spring out and there was tons of lube or oil on it. so i'm guessing that some of it froze up and then limited its movement. so i cleaned off as much as i could and went hunting yesterday. the temp was little below 20 and no problems. i'll stay with it for now but if it happens again, see ya. so the muzzy zero effect works pretty well huh??? i've never see it in person. thanks again.

kevin