Thanks for the your input . I received the Cm 031 and bought a cm 028. I was very lucky as I could buy them both at wholesale , which means when they break or when I feel like upgrading it will be cheap. I have been testing them both and both work well .I have gone over everything with the 2 guns ,I polished the internal of the barrels on both and lubed just the hopup , this seem to improved the accurtice , Aslo put a 9.6v 1100 mah battry in both , as i do not have a chronie I used the poor mans one . Both guns shoot straight thru both sides when I shot the back part the bb's dented the hard part of the tin, I would judge the speed was in about 300 to 330 fps, to me the cm028 does not feel as solid as the cm031 ,Cyma may be on the cheap side but it seems that they have pulled finger and have reworked there products. I have seen older Cm028 they are not as well made as this one(cm 028) i got. the hole gun feels solid , no scratches , trigger felt positive,speed and fps was acceptable for any stock gun.
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