I wanna do this but..Im kinda scarred. Im gunna use a buffing wheel w/ polishing compound.

Should I polish the entire chamber? I notice on the M98s youre not supposed to polish the entire thing.

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You can test your polish job by sliding your powertube into the assembled receiver halves. It should slide in easily but not rattle around.

Like in the pictures you can polish the entire insides of the receiver halves.

I wouldn't use any power tools to polish your internals. It takes like 5 minutes with brasso and steel wool by hand.

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I polished mine until it was shiney and haven't had a problem with mine.

Me too. I used only 3000 grit sandpaper with water on both my a5's. They are both fine (and smooth).

Thanks for the answers, i used 600 and 1200 wet sandpaper and then "brillo" to make it shine. The surface is almost like a mirror. The powertube slides in easily and if I use my hand I can feel a small gap, i messured 0.1mm gap.

Do anyone knows the effect of a to big polishjob? If you take to much?

Wow! Now that's shiny!

Yes im really happy with the finish, but im not so happy if i took to much Is there anyone who can confirm if 0.1mm gap is to much? What is it on the unmodified?

How's it shoot? I really doubt you took too much off.

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I agree. And correct me if I'm wrong but I don't think the 2 halves of the receiver are supposed to make an airtight seal. As long as the bolt doesn't rattle around in there, you should be fine.

What are Pollished internals suppossed to do?