Silencers should be removed from the NFA entirely. We’re talking about a muffler, people. In a sane world, it would be no more difficult to buy a silencer than buying a sling, magazine, scope, or other firearms accessory. There is no compelling logical to regulate them at all.
It’s silly for Short-Barreled Rifles to still be part of the National Firearms Act in 2016, when rifle-class “pistols” are now ubiquitous and are not a significant source of firearms used in crimes. It’s time for short-barrelled rifles to be pulled from the National Firearms Act. It was a silly idea in 1934, rendered absurd by the realities of firearm design in the in the 21st century. SBRs should simply be done away with as a classification and treated the same as any other rifle, regardless of barrel length.