This batch has our "Controlled Nitride Finish" with gray teflon
CNC machined from 4140 steel.
Has been rated by users as one of the best, if not the best fit on a Norinco spring. Our "Controlled Gas Nitride" finish adds a subsurface hardness that far exceeds others that are on the market, while not making the core metal brittle. The gray teflon finish has self lubricating properties, but only 4 microns thick so it will not add to the overal dimensions.
Unlike stainless steel you will not get the galling and binding after time that is so common with stainless steel used in this kind of product.