If you want acid wash goto DROID looks nice ,
villainpb won't do this type of anno due to risks of damaging the tolerances of the marker, not a lot of people realise to remove anodising you have to use acid which also removes the aluminium layer it is impregnated into, we're talking microns if done correctly but if it's done wrong it can scrap a gun!!
We have over 20 vats which are properly voltage amp regulated and temperature controlled, not a diy setup the quality of our work is second to none and our prices are much cheaper than most