1/2" threads dont leave much steel with certain bore sizes. I've been led to believe more meat on the muzzle = better. If you're going to put an adapter on there anyway and there is a "just as good" solution that leaves more meat on the muzzle, i'm interested.
I read something similar to this over a decade ago and it stuck with me, i didn't think it was with 5/8" threads though! So what if I can't shoot any possible differences, its just one more variable somewhat in our control.
Our friend Robert Whitley of ARX Enterprises LLC has learned, through careful measurement and testing, that some barrels threaded 5/8 x 24 TPI at the muzzle may not deliver optimal accuracy.
bulletin.accurateshooter.com