Quietening down an Air Arms Combat help !

[hellsquad]

OK next project is making my AA Combat quieter, I know the plastic stock is a sound/echo box and some fill it, but ..best fill material?
Next any other tips to calm the beast please, lovely gun but so noisy a firing cycle....
Cheers

[Shed tuner]

foam in the stock - not the expanding type, it will break it. Or bits of rubber matt (and foam). old rags. you get the idea.

Firing cycle - biggest gain is to find a spring that fits the guide properly, to stop the twang. Then add a piston sleeve to stop it rattling around inside the piston, and gob some grease on it all - you are not going for FT level consistency.

All that's then left will be a bit of muzzle crack - that's part of the fun, so leave it alsone... but obviously a silencer can be fitted if you really must.

PS Don't fit a PTFE piston head

[tinbum]

Ignore what he said, it's all rubbish!

Sell it to me


Ok, proper spring etc will help I suppose........

[hellsquad]

Ignore what he said, it's all rubbish!

Sell it to me
..

It is soooo good now! Even more not for sale

[Shed tuner]

good job.. I knew there had to be a reason with that guide

[look no hands]

I had a Combat project a couple of years ago but sold it on, the rear guide is indeed fixed and I had a friend of mine machine the guide down and then had him make up a delrin guide that slipped over the reduced fixed guide and then fitted the new spring snuggly, I never got the rifle back together to see if it worked.

Pete

[hellsquad]

foam in the stock - not the expanding type, it will break it. Or bits of rubber matt (and foam). old rags. you get the idea.

Firing cycle - biggest gain is to find a spring that fits the guide properly, to stop the twang. Then add a piston sleeve to stop it rattling around inside the piston, and gob some grease on it all - you are not going for FT level consistency.

All that's then left will be a bit of muzzle crack - that's part of the fun, so leave it alsone... but obviously a silencer can be fitted if you really must.

PS Don't fit a PTFE piston head

was going to try expanding!! had not considered it could break the stock...doh...I could brace it correctly. I really fancy expanding as it would fill void very well and should be the best way... and light !!
Oh shall I try it and let you know LOL !! It is near mint and do not want to break it........oh but the challenge !

As for the PTFE... ha ha, yea will give it a miss

Cheers

[FPoole]

was going to try expanding!! had not considered it could break the stock...doh...I could brace it correctly. I really fancy expanding as it would fill void very well and should be the best way... and light !!
Oh shall I try it and let you know LOL !! It is near mint and do not want to break it........oh but the challenge !

As for the PTFE... ha ha, yea will give it a miss

Cheers

These run an o-ring anyway. Also take a close up of how the trigger parts are installed as they can be a real pain to put back.

[hellsquad]

Firing cycle - biggest gain is to find a spring that fits the guide properly, to stop the twang. Then add a piston sleeve to stop it rattling around inside the piston, and gob some grease on it all - you are not going for FT level consistency.

Also would it not be ok just to change spring guide rather than all the rest??

[Shed tuner]

Also would it not be ok just to change spring guide rather than all the rest??

yes it would, whichever is easier... but I seem to recall I didn't do that on mine for some reason - I can only guess that the guide was either fixed, or had some annoying size / machining to the rear... eather trhat, or I just got lucky finding a spring that fitted and went with the simplest solution ?! Who knows, it was years ago

However, even the std spring rattled around inside the piston, so you need a sleeve regardless...

[hellsquad]

yes it would, whichever is easier... but I seem to recall I didn't do that on mine for some reason - I can only guess that the guide was either fixed, or had some annoying size / machining to the rear... eather trhat, or I just got lucky finding a spring that fitted and went with the simplest solution ?! Who knows, it was years ago

However, even the std spring rattled around inside the piston, so you need a sleeve regardless...

You were right it is a fixed guide Anyway I had the day spare so went for it !

I stripped it fully and DID use expanding foam I checked a few specs and used a B3 grade expanding polyurethane foam. I kept a few "blow holes" clear as it cured and dripped warm water in the blow holes to make sure the foam cured all the way through fast !
It worked better than I could have hoped !!! sorted !

I changed the piston ring, degreased everthing. Made a plastic "oil bottle" spring guide with internal "slip" washer.

Next as no way to get a suitable spring today or make new guide, I resorted to the good old Maccari tar, but only all over the spring guide end!
bit of moly here and there and a smear of some silicon stuff hanging round.

All back together and like a different gun !
Thank you for giveing the tips and causing a happy day !

[hellsquad]

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