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Old November 9, 2012, 05:10 PM   #10
Senior Member
Join Date: May 29, 2007
Location: St. Louis, MO area
Posts: 4,039
I'm with the "never" crowd. The only reason it might possibly need any attention at all would be if you shot a whole bunch of .22LR through a conversion kit. However, the conversion kit makers recommend you swap it out and fire a few full power rounds every couple magazines. Reason being, the high pressure from the gas on a .223 round will blow the junk out of there.

If you're going to shoot THAT much .22 through a conversion kit, just get a cheap gas tube, cut it off, and install it in the gas block upside down. Then swap back with a normal tube when you want to go back to rifle rounds. Spike's sells a small tube blank for this purpose, but it costs as much as a normal tube anyway.

If it ever gets clogged, it's a replacement item, not something to clean.
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