I actually didn't know that Lilja made a reverse, though I have used and like a number of Benchmarks. With the Benchmark, as far as my experience goes, the ones which are that size on the muzzle end are made to be counterbored for sporter class, with the tuner cut internally to get around the no attached tuner rules. The most logical solution would be to turn it down to a more manageable diameter. The danger is that if the bore isn't taper lapped sufficiently, you could end up with a loose muzzle.