best material to make a sleeve for a striker / hammer

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One issue to be aware of if you use Delrin is that the hammer will expand and contract a good bit with temperature changes so you may experiences with the hammer "sticking" at times.
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If the striker is separate from the hammer then this is a non-issue provided you only change the striker material. I personally used compressed leather on a 60+ fpe rifle as my striker. Quietest material you'll come across IMO. I've tried PEEK and noticed a very vague difference going to it from metal.
 
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One issue to be aware of if you use Delrin is that the hammer will expand and contract a good bit with temperature changes so you may experiences with the hammer "sticking" at times.
Click to expand...



If the striker is separate from the hammer then this is a non-issue provided you only change the striker material. I personally used compressed leather on a 60+ fpe rifle as my striker. Quietest material you'll come across IMO. I've tried PEEK and noticed a very vague difference going to it from metal.
Click to expand...


Understood, but based on OP saying "sleeve" I was thinking he wanted something on the outside of the hammer, not the inside. I was thinking the metal hammer "sliding" in the metal tube. I would have used insert instead of sleeve if I meant a "striker" within the hammer.
 
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A bunch of people have jumped in here with suggestions, one of which may be the right solution making this comment moot, however I'm a little vague on what exactly you're referring to. In fact I'm not sure what rifle we're even talking about. Further descriptions, specifications, and maybe even a picture or two could probably increase the quality/usefulness/accuracy of the responses we can give. 



Just my 2c. :) 
 
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Well, i looked again into the action but there is not enough space to add a sleeve on the striker pin. that was my first idea to reduce the noise when hitting the valve!

the weight of this hammer is 60g / 2 ounces

regulator is set to around 1000psi and i got a lot of hammerbounce

i want to keep the power sub12ftp and a much lighter hammer would be great for this kind of setup. 



1550006501_19842367755c6338e54de4f7.24898210_walther rotek.jpg




the regulator got no adjustment and i dont know how to set the reg up higher because i think that would help with the hammer bounce. i cant find any documentary about the belville washers stacks. it seems to be a secret!!

would you all make a lighter hammer from delrin ?

btw its a walther rotek / rotex in .177 




 
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So the sound issue is from the strike of the hammer on the valve stem? I would say I am definitely not an expert here, however inserting just a little material in between the hammer and valve faces, and potentially increasing spring force, might both reduce your hammer bounce and your sound level. I think there are a few suggestions above to this effect. :) 
 
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