Huben Hammerless K1

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Old & new

May I know what improvement does the new valve bring ?
 
My Huben has developed a very slow leak of about 3 bars per day. Just wondering if anyone has experienced such problem and if the location of the leak has been found.

Huben has a lot of connections and bad rubber rings. replace them all after that, bathe your rifle in the bath and understand where the air is coming from, we won leaks in 2 rifles
 
Huben has a lot of connections and bad rubber rings. replace them all after that, bathe your rifle in the bath and understand where the air is coming from, we won leaks in 2 rifles

Thanks for the tips. A couple of follow up questions if you don't mind : 

1) Do you mean submerging the whole rifle into water to locate the leaks ?

2) Can you let me know the locations of leakage found in your Hubens ?

3) Was the problem fixed by just replacing the Orings ? what types of Orings should I get ?
 
Huben has a lot of connections and bad rubber rings. replace them all after that, bathe your rifle in the bath and understand where the air is coming from, we won leaks in 2 rifles

Thanks for the tips. A couple of follow up questions if you don't mind : 

1) Do you mean submerging the whole rifle into water to locate the leaks ?

2) Can you let me know the locations of leakage found in your Hubens ?

3) Was the problem fixed by just replacing the Orings ? what types of Orings should I get ?

It is necessary to remove the bed, the barrel and the log, speed control there remains a tank for air and a box (I don’t know the English name); most often it is in the place of the journal switch and under the plastic cover. a lot of places .... need to check everything. The inner ring in which the valve runs is also damaged. The size of the rings is in the middle of this theme. Buy the best nbr 90 for moving places.
 
Clearly, one of the most commented on subjects. Not sure their is a need for semi automatic in this field. Very attention attracting especially in legislative arena. Also observed pictures that show fit and finish of stock to be less than caliber of FX, Daystate , Air Arms etc. So what else may be of poor workmanship. Not very maintainable as well. Can't say I am not intrigued. However, when I aim my Wildcat .25 Compact, I know what I aim at I hit. Just saying, that I for one am not sure about this.
 
I have been using Jsb Heavy (this one to have good performance has to be specific batches with head dimensions and skirt compatible with k1 barrel, Barracuda Match, Rifle Destroyer, Jsb Beast and slugs by MPmolds

May I know which one is the best for your Huben ? I am considering getting an MP molds ( 5.55 mm ) but would like to hear the others' experience first.