Being the early PSP P7 didnt come provided with the reamer/scraper tool or at least mine didnt have one in the cardboard box, which of the three available do you suggest? I see the black HK german made original that goes for $30-45. Also an American made one that looks like a clone of the german for $20. Then theres the neat looking stainless one that has a 4 in 1 use for 1/2 the price of the german factory original. Are the specs on the 4 in 1 stainless tool identical to the factory original on the scraper end? Is there any concern the stainless may gall or wear the piston tube/gas chamber walls? Did the maker ever mention if the stainless steel used is much softer than that of the pistol part? thanks for any help