I think the problem you'll have is that other used markers can be bought for the same or similair price. I've just seen a PM6 lowered to this price bracket and even he seems to be having trouble getting rid of that.
I think the proof in the pudding is in the eating, and if you havent sold it yet for that price, then it is priced to high.
My advice is to strip it back to stock and sell off all the extra's including the freak set as parts. If your left with something that isn't a working marker any more, don't fret as if you scour the wanted ads people are looking for grip frames, the breech, etc etc etc for projects so you can still make some money back on that.
I'll bet if your clever you'll get your £160 and possibly a bit more for your trouble.
I know as I've had do it myself.
