How easy is it to convert a semi-automatic rifle to an automatic?

There is a LOT of ideologically-driven B.S. about this issue floating around the web — from all sides, really. Perhaps as a consequence of this, all of the answers in this Quora thread (see below) that indicate some sort of excessive expense or technical knowledge being required to convert a stock semi-auto to full-auto are…well, let’s just say they’re either ignorant, lying, or sidestepping the obvious. So here’s the (obvious) scoop on this:

For about $200 in parts, $30 in really simple tools, basic familiarity with firearms, some average DIY aptitude, and less than a half hour of time, you can convert any over-the-counter AR-15 to a fully automatic weapon. And here’s the real interesting rub: you can do this “legally” in many jurisdictions whose laws haven’t caught up with burst fire conversion kits.

The concept in play is called “bump firing.” Basically it uses a sliding stock firing action to harness recoil, so that with very little skill (most people can get the hang of it on a first or second try), a shooter can fire at close to the same rate as a fully automatic weapon, and do so continuously. With a little practice, a shooter can unload clips just as quickly as many fully automatic weapons. Here are two example videos (using the YouTube search string “bump fire stock ar 15”):

Seasoned bump-fire shooter with $99 kit:

Pretty obvious amateurs giving bump-fire a try:

Again…this is all with legal, over-the-counter stuff using very basic knowledge.

The answer to this question, therefore, is: ridiculously easy, cheap, and (in many jurisdictions) legal.

And yes…to answer the obvious follow-up question…according to the AP and Time (, the Las Vegas shooter had bump stocks in his hotel room. So…yeah.

My 2 cents.

From Quora post:


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