Latest part made by PDI-Japan as sent in by Tomo for the Classic Army M24 Sniper Rifle... "Dear Sir, We got new products today, it's the 'CA M24 CS Cylinder Set'. If you have an interest,please introduce on your web site. It's made of Carbon steel,the tolerance of Inner Diameter is +-0.01mm. This pack has an CS Taper cylinder head.The piston & SP guide are available to PDI APS-2's. This set has KOUTETSU(CS) Cylinder & KOUTETSU(CS Taper Cylinder Head. We recommend you'll use PDI APS piston & Guide.

Inner Dia.tolerance is ±0.01mm even CS(carbon steel). Generally,steel is really cheaper material compared to Aluminium or Stainless steel. But we found & got high quality material as carbon steel.Its tolerance is same as stainless pipe."