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I have two AR-type rifles, the DPMS LR-308T and the DPMS Gen II AP4. Both are .308. Both are DI.
It takes a lot of shooting to get the LR-308T dirty. And never even once have I found anything in the gas tube. To do I use white pipe cleaners, so anything would show up if it were in there.
The Gen II AP4 gets dirty instantly -- all over the bolt carrier, inside the bolt carrier, and lots inside the gas tube, too.
I don't know why there is such a big difference, but at least, some rifles are way dirtier than others, even when they're pretty much the same.
It takes a lot of shooting to get the LR-308T dirty. And never even once have I found anything in the gas tube. To do I use white pipe cleaners, so anything would show up if it were in there.
The Gen II AP4 gets dirty instantly -- all over the bolt carrier, inside the bolt carrier, and lots inside the gas tube, too.
I don't know why there is such a big difference, but at least, some rifles are way dirtier than others, even when they're pretty much the same.
