I have a M&P R8 that is a real tack driver until the barrel loosens up. What's happening is that the barrel loosens from the frame and I take a small pin punch and tighten the spanner nut on the muzzle and the accuracy comes right back. The problem is that each time I do this it has the effect of opening up the cylinder to barrel gap ever so slightly. My cylinder gap is now at .022 inches.
What I need to do is remove the nut from the end of the barrel, turn the barrel back into the frame to reset the cylinder gap maybe with a small dab of Locktite and reinstall the barrel shroud.
My question is: Does anyone sell the spanner wrench that I need to crank the nut off of the barrel? I sure would like to buy a proper wrench rather than fab something up.
Thanks in advance;
Jim