Bump Fire Stocks don't work when pointing at a downward angle very well. Not to mention the fact that Bump Fire Stocks won't work AT ALL if attached to a bipod or tripod like those used by Stephen Paddock.

The consixtent, seemingly endless strings of full auto fire were not the result of trigher gizmos or gimmick stocks(none of those work reliably). This was a professionally machined fully automatic weapon.