For those looking for a tightbore precision inner barrel for their airsoft guns, especially 6.01 inner barrels, here is one for you. Lambda Japan announce the availability of their Lambda One 01 Inner Barrels and you can choose which lenght you want, from sniper rifles to gas blowback pistols... "Today we start to sell 'lambda ONE barrel'. It's inner Dia. 6.01mm, cold forged Stainless steel, made in Japan."