The biggest issue I have is with the $900 neutron star I still own. The machine work on multiple pieces is appalling at best. Choice of materials, design, construction... very poor in some instances. The hammer arrest system was deforming its self, and the hammer, and the receiver, hammer tube, as well as creating metal shavings inside the gun. To my knowledge, still does but to a lesser degree as it has been heavily detuned. Bad barrel. Cocking lever would just flop open because the pin hole was milled crooked and out of place. Many many tolerance issue throughout. Even the sight rails are just weird. Over sized so a lot of mounts won't even fit or do but end up severely canted or off center. Pic rail spacing is non standard. Mag notch in receiver is milled too deep so the mag flops around. Also weakened rigidity of the receiver severely. The list just keeps going and going. I also had a sortie and can list several problems there too. I understand some people have had good experiences. But how a gun that is $900 winds up THAT bad. Keep in mind I didn't even list half of the issues... that raises serious questions as to how that many things could be so wrong on one gun.