Muzzle Climb Reducer Experiment


Last week I took a look at a patent application for an AR-15 muzzle climb reducer. Bandito762 emailed in the class presentation for an engineering project he and a classmate undertook at the Rose-Hulman Institute of Technology. They attempted to developed a spring based muzzle climb reducer but discovered that their concept did not work. Science does not always go to plan 🙂 The presentation is embedded below.

I congratulate Bandito762 and his friend on attempting to advance the state of our art. I hope they both peruse gun-related inventions in the future.



Steve Johnson

Founder and Dictator-In-Chief of TFB. A passionate gun owner, a shooting enthusiast and totally tacti-uncool. Favorite first date location: any gun range. Steve can be contacted here.


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  • Phil Brereton

    Perhaps if they turned it round and had the weight moving against the recoil and not with it the effects would be better?

  • Scott_T

    It looks like more of a recoil reducer. Nice work.

  • Lance

    Makes a AK uglier but interesting very interesting.

  • Brian P.

    Haha, it kicked more? Gotta love the irony.

  • dylan

    i think bandito762 should have taken a look at archery stabilizers with “shock/jump reduction”. in these stabilizers, the foam or rubber type material that is in place to give the spring to the counter weight, is fairly hard. the reason for this is that bows have only a short recoil impluse, same as most firearms of ak type. therefor the compression of the counter weight must happen within a relatively short time in order to counter react the recoil impluse. the recoil reducers effectiveness will be dependant on the mass of the “inert object” and the strength of the spring material. if the spring is not stiff enough the inert object will only float as the firearm is fired or if it cannot bound and rebound in at least the same time as the total recoil impulse or preferably in the same time as the apex of the impluse, then the spring reducer will apply the force after the shot and actually increase muzzle movement. this is the reason why benellis inertia system uses suck a stiff and short spring, the recoil impluse is short and strong so the inertia system has to match this.

  • David

    I’ve always been curious as to why springs alone are used as so-called “recoil reducers”. I’ve seen all kinds of stocks, grips, mechanisms that have springs in them that supposedly reduce felt recoil. In the industrial world you almost never see springs alone used in this way.

    Dampers are used to absorb impulses, not springs. The shocks on a car’s suspension absorb the impulse. That’s why thick recoil pads tend to work so much better than novelty recoil reducers. The thick rubber/polymer/leather acts as a damper, not a spring.

    I can see trying to use a mass as a form of damper in that it alters the inertia of the recoil. On very tall skyscrapers, the top few floors are sometimes dedicated to a huge massively heavy damped and sprung mass that acts as a pendulum to keep the building centered in high winds. The mass would, much like in the skyscraper, have to be heavy enough to want to remain at rest during recoil. Looks like a fun project. Personally, I would go with a damper-spring combination with correct compression and extension rates regarding caliber. It would probably be a bit expensive as an accessory.

  • kvalseth

    I’ve always wanted to see someone put a gyroscope on a gun. Maybe these guys want to try that next?

  • Seamus

    Keep at it fellas

  • Bandito762

    We did think about trying to use a screen door closer but that was about mid way through the project.
    Since then I have also been working on a magpul for ak magazines. I have already had one rapid prototyped.

  • damien

    Its kind of obvious to me – you need a damper in there – something that will convert some of the energy from a motion form, to another form, be it heat or whatever.

    A spring-mass system, can, at best, just shuffle the recoil around in time.

    Why not try a motorcycle or bicycle shock absorber next time?

  • Vhyrus

    As a fourth year engineering student myself, I can say this is an extremely effective example of an excellent feasibility study. Using only a modest amount of resources they were able to develop and test an idea from the ground up and come up with hard numbers. I might show this to some of my professors. The idea failed but the experiment definitely did not. Very impressive.

    On a side note, you may want to take a page from the kriss super v system and try to rig up something that kicks a weight down instead of back. Definitely more difficult but youll probably have better results.

  • So heavy is the chain of wedlock that it needs two to carry it, and sometimes three.