If your PS has 4 stock screws it is a MK2 (96mm stroke) Same as the MK3 TX If it has only 2 stock screws it is an earlier (82mm stroke) model -MK1/2 TX spring.

If still available, I will take the second set please. PM on the way

PM sent

The TX has a 3.8mm transfer port. The LGU is made with a 2.9mm port which tuners open to 3.3 to 3.5mm. Possibly the TX port is to large when short stroked. The SCR is wrong and it creates a harsh firing cycle. I may of course be wrong I sleeved my TX port to 3.2mm and quite like it. It may be better...

It was mostly trying different combinations of parts. The only re-engineering was sleeving the TP. That was simpler than I expected. After a few/lot more pellets I have found I can watch the pellets fly at 35+ yards which I like. There is still some hold-sensitivity though. If I support the front ex...

I have been tinkering with various combinations of Pistons, springs, transfer ports and seals. I have finally found the shot-cycle I really like. The rifle is a MK1 .22 TX. The piston has a polyurethane 0-ring which give a slightly shorter stroke (81mm) The spring is from a MK3/ProSport (225mm, 3.0m...

yes please. Paypal?

Thanks.Had a look. His prices are a bit too high for me. The last 2 NJRs I saw for sale were £500 ish.

PM sent
One please.

I stumbled across this video, 'Visiting the Air Arms factory!' Uploaded last week. (Sorry, I can't do direct links)

unfortunately not much about TX200s or SRs.