i have just been shooting my aa s400 and decided to take the silencer off . i had just cronoed it and it was doing 790 fps with aa 4.52s. anyway as soon as i shot it with out the can the point of impact went up the target about 2 inch .iwas just wondering if this will put it over the limit and do the makers crono them with no can .and is this why we hear of guns haveing low power as we test them with a silencer fitted . just a thought. anyone shed any light on this 177