Furtekjr

Hello Everyone, I am the proud owner of a Benelli M2 Field (left handed). I have had it for a few months and go through 3-5 boxes of shells a week. I have been cleaning it religiously after each and every trip to the range. To clean the barrel I have been using Shooter's Choice Shotgun and Choke Tube Cleaner. I spray some down the barrel (with it removed), let it sit and then run a bore snake through it. Anyone else use Shooter's Choice on their Benelli's? I have heard elsewhere that it is fine, but just want confirmation. Also, I wonder if anyone can tell me what the black "stuff" is on the base of the barrel lug is? I am talking about the stuff that is on the right side barrel notch. The stuff looks like grease or some sort of rubber coating. I again just want to make sure I am not damaging it, since a little bit of it comes off each time I clean my shotgun. Thanks! Joe