An interesting bore stroke question...

[look no hands]

Having said that, and taking into account WonkyDonky's "Taming the HW80 my way" thread, maybe an updated HW80 with piston bearing would do us nicely, with the stroke from just over 50mm upwards. And 20+ ft.lbs easily achievable with the longer stroke. Wouldn't take much work, either......

Very true but I thought that when this was discussed a while back, we all wanted a light to medium weight rifle (something to better the 99 in theory), so a sleeved down HW80 size gun would limit the market as well.

Like what's already been mentioned and what Bigtoe once said, all it needs is a different length piston rod and that's a lot of the problems solved, for not a lot of money either (about an extra 50p worth bit of metal according to Tony) and everything else (apart from the spring and a top hat may be) can stay the same, thus reducing costs even more and all the person on the assembly line has to do is choose between three different pistons to what ever power model they are assembling at the time, all the manufacturer has to do then is to make the agonising decision whether or not they want to undo all their fine engineering work by adding fishtail checkering to the stock

Pete

[RobF]

If it's such a good idea then why isn't it being done. After all it's a competitive market, why not get one over on your competitor?

[thisisdonald]

It could easily be done if the design was similar to the AR upper and lower receiver

[RobF]

It could easily be done if the design was similar to the AR upper and lower receiver

So why isn't it done?

[air-tech]

It could easily be done if the design was similar to the AR upper and lower receiver

So why isn't it done?

Not quite getting the potential for comparison

[look no hands]

Not quite getting the potential for comparison

I can't even work out how an AR set up could even work in a springer, plus it would make it look like a Air Arms Combat

Pete

[oldcurmudgeon]

This has already been done by the Webley Tomahawk which uses two different pistons to achieve different outputs from the same platform. Admittedly the top power was between 18 and 22 foot pounds and the lower was 12 foot pounds, the difference being a stroke of 3 and 4 inches, so a stroke of 2 to 2.5 inches might well deliver 6 foot pounds of energy.
All in all it could be done but not at 30 foot pounds output.