Damn i have been looking for one for my son
I wouldn't recommend a Bone Collector, or any ML with a false muzzle. Doesn't mean that some dont shot ok. My limited experience has been less than stellar, basically they make it so you cant inspect the crown... and the crown is a wee bit important.
I have cut the QLA off of a bunch of tc barrels and all of them have shot better without it. I have a regular triumph and a bonecollector that have been cut to 21” barrels, both shoot great
My hunting partner and i both have one, mine shoots ok, his was awful. We cut the QLA off and that helps, considering doing mine as well. Just have to redrill the front sight.
Sounds like you had good success removing the QLA, apparently if they are not perfectly concentric the exiting gas throws the bullet off.