Variable Power Break Barrel

[FastDave]

Why not?

1/3 cock
2/3 cock
full

or some other variation that gives good spread.

Shouldn't be too hard to do.

[lefteyeshot]

Tree different weight pellets?
Three different sears?
Adjustable gas ram?
Different number of pumps on a multi pump?
Three different barrels?
My Beeman model 2016 double barrel has a .177 and a .22 barrel that can be fired independently? Maybe a tri-barrel? Why not a quad barrel, .177, .20, .22 and .25?
Adjustable pressure release just behind the transfer port?
Adjustable transfer-port?
Three holes with screws behind transfer port at 11,12 and 1 o'clock in the receiver and remove one, 2 or all screws?
Trap door breach like a Norica Quick or Dream Hunter with an adjustable T.P.?

[splitbeing]

Some hatsan gas rams have fill ports and can be set at the pressure you pump it to. So that is a very doable option.

If transfer port adjusters are on pcps, why not a springer?!?

Put the two together, I'm imagining a springer with a gas ram that has a degas screw and fill port accessible withouyt removing the stock along with a transfer port adjuster.

[DanD]

The old Theoben Dual Magnum rifle and the current Weihrauch HW45/Beeman P1 pistol are piston guns with multiple power outputs.

[longhunter]

Look up the Wishcombe series of aririfles.