I have been using Gunzilla to clean shotgun bores for about 10 years. First saw it at the Grand American Tournament and while being very effective on plastic wad residue it is also much safer to use than some other solvents. Like some have mentioned, I didn't think I was getting wad buildup until I cleaned a bore or two with something like this that is very effective. I clean the bores of every shotgun I shoot every day after a hunt or trip to the range. Didn't always do this but had the chambers rust in a nice M21 Winchester because I was lazy. One of those things that make you sick when it was so preventable and I vowed it would never happen again.
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