FWB Feinwerkbau 150 - help needed

[jps2486]

Leave the cast iron piston ring alone unless you see it broken. These never wear out, but unless you are really careful, you could break it when removing it.

 

[Wadcutter]

Easiest way to remove the piston ring, if you have thumb nails, is to spread the gap and lift up on the back side. It will pop right off.

 

[Bear-of-Grayling]

Beautiful gun. I got two of those earlier this year so my son and I could have matches using identical guns. Equipped both with adjustable iris apertures. I have a newer FWB 300 and prefer the stock on the older 150.
Here if you wish to send it out. David has reworked several FWB guns for me over the last few years Excellent work.
I have a 150 sr 32718 and an email from FWB says it was made in 1968, so am guessing yours about 1970-72

Watching this one. Very nice work, my friend. Curious, though...... This one's not a lefty. Are they that hard to come by? "Cuz I'd love to find one in left hand.

I don’t know if these were ever made with a left hand stock. I had a 300 mini back in the 80’s. It was a lefty. Still a right hand action. FWB never made a true left hand model. Just the lh stock with a right hand action. Like most lefties, I do most thing with both hands. I actually prefer the rh action. I cock it with my right and load with my left. I can hold back the cocking arm while doing it. This stock feels perfectly fine from the right side. Even my palm is good. I also like this trigger better than the 300. The 300 is a “glass break” trigger. I found it difficult to shoot in my league. I like a squishy trigger, predictable but without a wall. I used the Diana 75 t01 and loved that trigger. This one on the 150 reminds me of that t01.

 

[Pellets&Pistons-(Razor62)]

I know what you mean about the right hand action being perfectly fine for a lefty. I use your technique holding the action open with my tricep against the lever and my hand on the stock. I'd have a hard time getting comfortable behind that stock though, because of the grip design.
Doesn't being persecuted for being a southpaw tick you off...? LOL! I want one! but it's got to be a lefty or no dice. I don't know if they ever offered one either. Maybe someone else can shed some light

 

[Chuck-in-Ohio]

I always prefer to remove the ring to flush all the old gunk and funk out of the piston groove, then relube the ring. I am guessing that a good flush out with carb cleaner or a similar substance would serve the same purpose, I just do not feel whole unless I disassemble stuff down to component bits.
Straight silicone is a no go. Superlube with ptfe would be suitable and readily available though.
I think you would be better served with a modern fluoropolymer lubricant due to the small quantity required for maximum lubricity. It only takes a very light film to lube the compression chamber and the associated ring as you will find out. Be sure to withdraw the piston from the compression tube after lubing and cycling it by hand a few times and you will see. Wipe out the excess and away you go!