i've recently purchased an air arms walnut thumbhole s410 carbine in .177 flavour,i got a mamba pro 2 5-30x50i sat on top, using air arms diabolo field 8.4's it's producing 1/4'' inch groups at 30 yards, straight out of the box, done a bit of practice in the garden on paper targets at different range's, looking forward to having a shoot at my permission.