The LGR is a Single Stroke Pneumatic (SSP), and is a damn fine rifle. It's a 10M rifle so power is around the 6fpe mark. I don't know (but I would doubt) if the power can be upped, certainly to the 11-12 fpe range.

One in a shop will go for £300 - £350 depending upon condition (well the last 2 I saw did), so privately an A1 gun would fetch considerably less.

If your example is as rough as a badgers chuff then oviously it will be worth less than the private sale value.

I am sure a few others out there can correct me if this is wrong, and I have no doubt they will be along soon to do so

So there you go, I haven't answered you at all.

If you can post some pics then I am sure a few of us would be able to give you an estimate of it's worth, and yes I would be interested if it were to go up for sale.