Repairing & performing accuracy work for a pair of 1377's??

Is their someone to send these guns to, to repair one 1377 and accurize both at the same time or is this something I should do myself? I have a machine shop and all the tools but have never worked on airguns. I usually can fix or repair anything but I am wondering if someone out there would do better than me stumbling through it for the first time? I would like them both tuned with better triggers etc. I am a very busy guy so I am not opposed to just sending them out for the work.

I have a first generation 1377 all metal except the grips and it does not hold air when you pump it you can hear the air leak out. I also have a 3rd generation 1377 that holds air fine but has a horrible trigger and sights. I would like to possibly put better rear sights on them both. I might also like to add a scope rail I have a nice new Millet red dot I have never used I could install if I had a scope rail.

Thanks Mike
 
I ordered my parts from AC Custom & Archer Airguns. I bought a new flat top piston and air chamber from AC for the gen 1 1377 and a new hammer spring. I ordered a steel breech for the gen 3 1377. When I get both guns shooting I will shoot them over the Chronograph to see if the flat top piston upgrade is worth doing to the gen 3 as I can compare them. I may machine my own parts for the gen 3 pistol after seeing the parts I bought. I will post some pictures of the build and maybe a video. I have looked at the pictures of the power adjuster they make for the air tube plug and that is a very straight forward easy to build part on the lathe so I will be making that part myself for both guns.

Mike