Thats the first time I have heard of someone deburring the internalsWell, thanks for all the thought in the replies.
and to answer the million dollar question...... MINI!
bought one for not a lot from StevieT, nice chap he is too, just happened to be 3 miles from where i finished a job for the day last week so we managed a face to face.
Very impressed i am with it. yet to shoot in anger, but familiarising with it, it is growing on me quickly. First thing i did was a full strip, every screw. Taken some time to deburr passages and holes in the air system, mainly cos i'm anal about that ****, and partly to improve consistency. Deep clean, and lube. Waiting for a spares kit to arrive now to fit a new check valve and try it again.
I've got a two hoops style chrono with 60 shot string memory, so i'll do some testing with fps consistency at differing rates of fire, and post it up for general musing. Be a couple of weeks before that though.
Cheers again all.
Kudos