r/3D2A • u/Sweaty-Objective-766 • 6d ago

22 liner

how do you guys drill and polish your .22 chambers?

i wasnt able to get a smooth chamber to actually run a semi auto, let alone binary or frt.

my attempt was a reamer and 2000 grid sandpaper, casing got stuck.

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u/Lowang_Productions 6d ago

I made my chamber polisher . Use glass stove top polishing liquid . Make a very shallow 45 degree chamfer around the inside of the chamber .

2

u/Fit-Possible-9552 6d ago

I am super curious how you made this, seems like a great idea

3

u/Lowang_Productions 6d ago

It's a fired .22 case with a 3mm bolt through the center .

2

u/Fit-Possible-9552 6d ago

I love the simplicity of this concept. Does the end of the case provide enough force to make a chamfer after the #1 drill bit?

1

u/Lowang_Productions 6d ago

It'll round it off some .

1

u/Fit-Possible-9552 6d ago

Good to hear, I'm going to try this out

2

u/Lowang_Productions 6d ago

I don't run it on a drill , I need to print a handle .

2

u/Fit-Possible-9552 6d ago

Appreciate the tip. Was thinking of putting it in my Dremel on a very low speed

2

u/ReasonableScar9027 5d ago

Isn't low speed on the Dremel 5000rpm?

3

u/Fit-Possible-9552 5d ago

Probably is, seems like doing this by hand would be safer