Airsporter S group

[junglie]

Only certain models had the grub screw, I know the .25 models had them and I remember seeing one on a Stutzen but my one doesn't have one (first thing I checked when I stripped the rifle), Tony Wall at SFS told me about the grub screw many many years ago.

Pete

My .22 carbine rb had one & a .22 brum supersport i had too.

[maximus]

After further attempts yesterday with my 22 MK2 and 22 Mercury S. I ended up with a couple of jobs to do. I decided to strip my 177 mk1 and reduce the power. Did this today by removing approximately 10mm of pre-load. This has had two affects. Power is now 10.5ft lbs and the slight amount of spring twang has gone, happy days!
The second job is on my mk2. When I mounted the scope on it I noticed the cylinder rotating!! This is due to the back block not tightening up properly, just needs adjustment. Despite this I shot some very reasonable groups but will try again when fettled. Had a quick go with the 177 mk1 this afternoon and it does seem slightly easier to group with. Will have another go soon once all the fixing is done.