I see what you are saying and I agree. But it is a throwaway for him, a little chicken bone to the gc people. You can do the bumpstock trick with your jeans. He doesnt mean it. But yes, as a constitutional purist is was wrong. Hes got bigger fish to fry right now.
And I would have been the first Trumper on FR if it werent for the time difference. Only reason you beat me. ;)
Frankly, I see no bigger fish than recognizing he made a Constitutional mistake, recinding it, and getting his chicken-bone the right way -- through a bill.
There simply is no bigger fish at all, save, perhaps, nuclear or conventional world war.