SSG anti bounce spring stop

[Daztilley]

A while ago on one of the american forums a guy posted about a design he thought could stop hammer bounce in airguns...... it is a spring guide that the hammer spring runs on ..

How it works.... the spring guide is fitted to the gun with a 0.5mm clearance between the SSG and the inside of the hammer - so that when the gun is fired the spring forces the hammer forward until the guide stops the spring expanding - the hammer hits the valve - opening the valve and providing the firing pulse of air into the barrel to propel the pellet down the rifling. The valve spring then closes the valve - forcing the hammer back towards the hammer spring...... normally the hammer spring then forces the hammer back at the valve and slightly opens the valve again - which causes another small pulse of air into the barrel..... this causes extra noise and wasted air...

But with the SSG the hammer is separated from the spring by the spring stop - so when the hammer comes back from the valve it hits the guide which holds the hammer spring under tension and prevents the hammer moving forward and opening the valve again👍

In effect - you end up with 1 very consistent hammer and valve cycle - which does not waste air and you get a vastly reduced spread between shots

MARTIN444 liked the idea and made 3 prototypes for me to test (pic below)
I fitted one into my MFR- making sure there was 0.5 to 1mm clearance between the hammer and SSG ..... filled a 12 shot mag with .22 pellets straight from the tin and started a chrono string....

Things then got very interesting.......

Each chrono shot was within 1fps of the last shot 🤔
I thought my chrono was broken....
But no - the extreme spread over a 12 shot mag was 1 fps

The shots were snappier and slicker with less noise from the action and shot count from each fill will have increased with no wasted air 👍

[KevG]

Clever bloke is martin and a proper engineer.
KevG

[Daztilley]

Yep - great idea and martin turned it into a great working prototype
Have just watched the hammer bounce video - I had no idea it bounced so much kev
Must have a great influence on shot count over a fill 👍

[KCE]

Does that work on  the same principle as your double tap inertia Kev or are they two different things.

[KevG]

More or less same end result but a different  way of going about it.
KevG