Webley Mk3 issues

[jirushi]

Louis, is the seal too tight a fit in the cylinder ? Also is it a thin lipped parachute seal design ? Regarding the hard cocking I have found a strange phenomena on a lot of old MK 111 rifles that the cocking lever is very tight in its hinge bracket, giving a lot of resistance. Disconnect it from the piston and see if it swivels easily. I have had to shave off some metal to make them move smoothly.

Baz

Thank you Baz. The seal isn't too tight. It feels good, when moving the piston up and down in a partly assembled state (without the spring).

But still, I wonder if it's too loose. The Webley cylinder probably isn't exactly 28 mm, as it will have an imperial size? Last time I measured I read 28 mm, but I'm not sure how precise I was.

Here's a photo of the top of the seal (a bit blurry sorry). It's pretty tough material. I'll order a 29 mm Lightning SE seal and see if that is any better. But I think I should try 5.6 mm pellets first (if I can find them...).

Yes the cocking lever is tight in its hinge bracket. But certainly not that tight that it would explain the huge cocking effort. I think that's down to the new spring, and 2 steel washers that I put on both sides of the folded top of the steel piston sleeve if that makes sense. But mostly the short cocking lever.

[rockdrill]

Just a thought, but that looks like a lot of lost volume over the head of the screw that retains the seal. What effect would that have on output?

[jirushi]

Just a thought, but that looks like a lot of lost volume over the head of the screw that retains the seal. What effect would that have on output?

That's a good question. Haven't thought about that. Could try to fill it with something (?) and test the difference.

[mrto]

The thick buffer washer behind the piston seal will be reducing cylinder volume,effectively short stroking the piston can the thickness of it be reduced or even completely done away with?

[jirushi]

The thick buffer washer behind the piston seal will be reducing cylinder volume,effectively short stroking the piston can the thickness of it be reduced or even completely done away with?

Another good idea. I guess its function is to absorb the shock of the piston hitting the cylinder wall (which shouldn't happen that much, in a well balanced gun ).
I will take it out, the seal should then still fit. And then I'll report my findings.
Still need to find some 5.55/5.6 mm pellets though haha.

[mrto]

Another good idea. I guess its function is to absorb the shock of the piston hitting the cylinder wall (which shouldn't happen that much, in a well balanced gun ).
I will take it out, the seal should then still fit. And then I'll report my findings.
Still need to find some 5.55/5.6 mm pellets though haha.

Wasp pellets can be got in 5.6mm,

http://images-nitrosell-com.akamaize...mm-pellets.jpg

as well as Marksman pellets,

http://images-nitrosell-com.akamaize...mm-pellets.jpg


Neither are great,but they are proper .22 cal!

[jirushi]

Wasp pellets can be got in 5.6mm,

http://images-nitrosell-com.akamaize...mm-pellets.jpg

as well as Marksman pellets,

http://images-nitrosell-com.akamaize...mm-pellets.jpg


Neither are great,but they are proper .22 cal!

Much appreciated. I'll have a look. Hwtyger on here is a fellow "Dutchie" and has good results with H&N FTT 5.55 mm, which are available over here. Will give those a try first.

[Geezer]

Neither are great,but they are proper .22 cal!

Bit of an understatement. They are both rubbish, especially wasps.

Try RWS Superpoints. They may positively surprise you.