I have just finished a total restore on a bsa airsporter .177 mk2! All metal reblued,wood all done. I got the nyloil piston head assembly, ultra top hat spring washer,ultra mainspring guide & trigger spring from T.W.Chambers & Co. Used original spring as it was in good condition. What a difference its so smooth & quite you wouldnt think there is a spring in it! I have no chrony but the power is up alot from the shots i have fired at targets in my field.when i get a chrony i will post the power! Does anyone know what silencers fit the mk2 .177? Also does anyone know of scope mounts or adapter mounts that would fit correctly? I would like to fit the scope further back! Cheers all