With the exception of the bump stock, which was "stupidly" approved for sale in 2010, the weaponry is virtually the same as it has been for decades. 
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Around 1970 (okay, in 1973) there was a fundamental shift in how both The Government and Our Society views human life, defines human life, and excuses the mass murder of human life. That was a fundamental shift from how this country and our society thought about life before then that has no parallel in the Wild West or the Gangster Era. 
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In 1973, the SCOTUS legalized "murder for convenience sake"...devalued human life...made the decision of life versus death an "individual choice"...and liberals and Democrats still defend that devaluation of human life 44 years later.
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But some things have consequences that should have been thought of. Bump stocks were for the disabled. Abortion was for the unborn. But an entire generation or two has now been taught to devalue human life.....and The Las Vegas shooter was the latest to "misuse" both