"Step-Up-Action" is one of my main repeat release system.

I made some guns that have "Step-Up-Mechanism"...

This (P301 ARC)...

And this (P302 ARC II)...

And this (P303 GIZA66°)...

And this (P306 OTTAMAGATER)...

And this (P307 DARC)...

And this (P308 KIRETT)...

And this (P402 XROSOVER)...

And this (P608 MOGUL).

They have an each different method or mechanism to work the "Step-Up-Action".

The new work, P312 UPPLE. It has a mechanism that is a mixture of P307 DARC and P303 GIZA66°.

Each part of the rear holding-hooks is a semi-circular.

The releaser also has the same shape as the above.

Full loading, 6 rounds.

This gun has only one moving-part.

The releaser is moved upward only one step by the force of the rubber bands. I call it "Power-Assisted-Step-Up-Action".

This design is similar to other P300 series. Two panels that are thin as 2.5 mm.

The half trigger guard for the trigger spring.

The right side view.

The left side view.

Made from japanese tilia plywood. The grip's material is keyaki (japanese zelkova).

Please watch Video.

YouTube video