Cosd Posted January 8, 2015 Report Share Posted January 8, 2015 (edited) After a day out yesterday decided to do a full strip down of my Beretta A400 Extreme. The gun looks like it just came out of the box both inside and out except for one small place. I can't shift a small area of carbon on the piston. The whole piston was black with carbon and 95% of it is gleaming now, just this last bit is being a stubborn ******. Any tips please? Edited January 8, 2015 by Cosd Quote Link to comment Share on other sites More sharing options...
brett1985 Posted January 8, 2015 Report Share Posted January 8, 2015 soak it in diesel or parafin. or bore solvent. i use an ultrasonic cleaner for my 1301 piston. comes up like new most times. Quote Link to comment Share on other sites More sharing options...
a303 Posted January 8, 2015 Report Share Posted January 8, 2015 Fine brass brush, works excellent for me on 391s and 303s. Quote Link to comment Share on other sites More sharing options...
Malik Posted January 8, 2015 Report Share Posted January 8, 2015 I suffer the same problem, around what id describe as a piston ring. WD40 and this wire scrub thing i have works... Tedious though. Quote Link to comment Share on other sites More sharing options...
Cosd Posted January 8, 2015 Author Report Share Posted January 8, 2015 I don't know if this matters, but the main crud has come off. The metal feels clean and smooth to the touch, it's just black in colour. I know this can come off as it just a little left in a small area now. I'll try a brass brush and see if that helps, else I will get some diesel and try soaking it. Quote Link to comment Share on other sites More sharing options...
Harnser Posted January 8, 2015 Report Share Posted January 8, 2015 Sounds as if you have got it clean enough . It will only get dirty again when you next shoot it . Harnser Quote Link to comment Share on other sites More sharing options...
Fuji Shooter Posted January 8, 2015 Report Share Posted January 8, 2015 I used to soak my gas piston in carb cleaner - came out very well Quote Link to comment Share on other sites More sharing options...
kenholland Posted January 8, 2015 Report Share Posted January 8, 2015 same here, that's all I use choke and carb cleaner plus green scouring pads from the pound shops for those stubborn rings job done. ...kenbo Quote Link to comment Share on other sites More sharing options...
Cosd Posted January 8, 2015 Author Report Share Posted January 8, 2015 I used to soak my gas piston in carb cleaner - came out very well I used Carb cleaner to clean it but sprayed it on and after five minutes agitated it with the wife's toothbrush and wiped it dry. How long can I soak it for? Quote Link to comment Share on other sites More sharing options...
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