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In an AR15 I honestly think it will be hard to shoot enough 22's through it to be a problem unless that is all you shoot through it for years.   and what will need cleaning far sooner than the barrel is the actual 22 unit and the inside of you lower, and if you shoot a whole lot your gas system will need cleanning befor you go back to .223...

I have a ceiner kit for my 16, with the 16 it is real easy to go through a bulk pack of 22 each time you go out, so things get dirty.  Can't say I have ever worried about cleaning the barrel any special way.  360ish days a year it is in a "dedicated" upper, but for those other 5 or so days I need to use that upper as a .223 upper so I have a simple procedure to "Clean" it for .223 use...I throw on a balnk adapter, shoot a couple .223 blanks to blow out the gas system and I am ready to go...

Really I'd worry about crapping up the gas system long befor a little barrel leading...


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