Gas Ram conversions

Well i have the new high spec ram installed in the gun today but i have noticed right off the bat that it would not preform as i would like, I could see this even before i installed it. the outer shaft seal is not what i wanted and i could see it would not do the job.

Used using a simple compression test on the bench I could tell they did not put the vent groves in like i wanted and as a result when the pressure is released off the ram there is back pressure building up inside the seal and this will restrict the movement of the shaft moving forward.

I did install it just to see what would happen but as i thought the thing did not preform. Very disappointed in the end result. I took a hacksaw to the base of the ram and cut the end off. pulled the ram apart and checked it to see how they made it.

It looks very simple and i can easily knock one up in my workshop with the specs that i know will work. I can see improvements of the ram that they have sent me that will increase the life span of the ram as well. Will keep you posted

Greetings.
This is my first post. I signed up last night.
Any way, I am new to air rifles / air guns, but have been reading a lot about them lately, and am keen to get my hands on a good reliable, QUIET, low recoil air rifle, that is easily capable of knocking over possums, and is accurate. I don't have a FAL, and can't be bothered with getting one again. I have a possum v fruit tree problem !! (sorry - not trying to side track this thread)

Anyway . . . I am interested in this topic regarding conversion from spring to gas ram. Can any / most spring guns be converted ? I'm not technical, but could most gun shops do a conversion if a ram was obtained ?

Good luck with your conversion. You obviously have pretty good technical skills to manage this process. I will be keen to read your results.

Cheers,
Grant.

I decided to start my gas ram again from scratch. The parts that they supply just do not look like they would last very long so I have got my tube i will be using and i have just finished the seal for the piston. I decided to do the seal first because it is the hardest for me to machine. The plastic does not like fine cuts so i can machine the tube out or make the shaft step to suit the internal hole in the plastic.



After machining the OD of the plastic it is time to do the internal hole.




Next i need to machine a angle on the OD so the plastic will expand to seal against the iner tube wall when pressure is added to it.









You cant really see the angle because my light is not the best but it is good :)



Tonight i will machine up the piston and shaft.

Looking interesting mate, watching this build :)

This is my test tube with the inner tube valve  :) I have just figured out a cool little one way valve that wont take up space inside the tube so the piston shouldnt hit it.

I will try to get it done tonight because i have just been told that we are going away for the long weekend..... and the dragon-inlaw ops... my mother in law will be joining us.

Edited by Nunga - 26 Oct 2013 at 9:59am

Nice work bud, if you'd had it together earlier it might have helped with your dragon problem :)

944 from a .22 is bloody good! The second photo at 365...... Not so much :)