Can you identify this

[Rotherham Owl]

0698af09-6852-4dd7-9e9d-1a40ce291009.jpg (47.87 KiB) Viewed 5480 times

I have fitted a reg to my S200 and am now wanting to tune it. I have opened up the transfer port and moved on to sort the hammer spring adjustment.

I thought I would have a simple grub screw to loosen but have come across the screw below. Can anyone tell me what this is called and what I need to loosen it?

Thanks in advance.

[Roger5]

It's an anti tamper cover, you will have to find the tool for it, Clas Ohlson.com might do it. Or have a look on ebay security bolts. Rog

[Rotherham Owl]

Thanks.

I am struggling to find a tool to remove this so am considering just using the ventura screw to tune the power. Will this suffice?

[Raj]

In spite of tuning large numbers of these rifles, I am unable to see where on your action this picture is
Could you please post another picture zooming out a bit?

[Roger5]

In spite of tuning large numbers of these rifles, I am unable to see where on your action this picture is
Could you please post another picture zooming out a bit?

Me to, just taken butt section of mk1, and can't work it out either, spooky or what. Rog

[pelletcaster]

Hi lads,

look here - I modified one of my pictures about the recent tune of my CZ200S-Green .177 to show you said screw. It's definately locking part #22 - adjustment screw.
I tried to identify it on the parts list but I'm not sure. Maybe it's part #2 - M4x5.



The scew at the pictures of Rotherham Owl shows an Allen head.
I'try to find a strong fitting thus slightly oversized Torx tool and hammer it little bit into the head carefully. Then screwing it out.
It may be loctited so you may have to heat it up before little bit with a hairdryer or an electrical heat gun to break the glue.

Looking forward to the outcome.

BR - Andreas

[Roger5]

Part 2 is locking grub screw in striker, and 22 is hammer spring adjuster, this one dsnt seem to have a part number, but it's to lock HS adjuster. Rog

[Rotherham Owl]

Thanks for the replies with this.

I managed to basically knock the hex type top off the screw & the standard alllen key grub screw was underneath. It had been locktited but it only took a bit of extra effort to loosen it and there was no need for any heat.

All has now been done & it was worth the effort as now getting 90+ good shots at 11.20fpe.

[pelletcaster]

Thanks for the replies with this.

I managed to basically knock the hex type top off the screw & the standard alllen key grub screw was underneath. It had been locktited but it only took a bit of extra effort to loosen it and there was no need for any heat.

All has now been done & it was worth the effort as now getting 90+ good shots at 11.20fpe.

Nice & helpful experience for a lot of us.
Congrats
and Happy & Safe Shooting
Andreas

[Raj]

OK - I got my glasses on and see the issue. The colour also threw me off course because the actions are usually anodised black. Roger5 and Pelletcaster are perfectly right. In all the rifles I have seen with a screw in this hole, it is a simple grub screw that locks Part 22. In about 50% of the rifles (including my own), there was no grub screw at all. I actually bought one and put one in myself.
To me it looks like someone has broken off an allen key and stuck it in the grub screw socket. It should come out with a 'stud extractor' or a 'left fluted drill' but centering either tool is going to be very tricky.

Worst case, you can drill the whole thing out oversize ... say to 5mm. You wont need to do anything to this oversized hole because there should be another M3 tapped hole on the opposite side of the action which you can use to put in your own grub screw to lock off No.22 when you are ready.