All I know is the stuff works. My primary elk rifle is a 1968 Sako 338 with a Bofors steel barrel. Before DBC you could open your own copper mine in it after a shooting session. Did the DBC trick using the old instructions and clean up is a breeze. Shot it this weekend and after this fall's elk hunt and this weekend's shooting it was time. 2 hours with Wipe Out and three patches had her clean as a whistle. Love DBC.
You only live once, but...if you do it right, once is enough.
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