I'll consider agreeing with the "beyond sufficient" concept when our government returns to the doctrine of 'least intrusive means." Cops use all means to protect themselves even when they have little to no 'just cause' to feel threatened. Bureaucrats also fail to abide by 'least intrusive means.' The M-16 was designed as a 'least intrusive means' of removing an enemy combatant from the field of combat. If they wanted true 'knock down' power, they would have gone with the 308 Winchester or NATO equivalent (7.62). Instead, they chose the 5.56 NATO as the least intrusive means to take down an enemy that also provided an opportunity to carry more rounds of ammo so they could use 'least intrusive means' on more enemy combatants.