Operating Systems Omnibus 1: Tilting, Trapping, Recoiling

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So far in our exploration of firearms operating systems, we’ve covered ten different mechanisms for locking and actuating an automatic firearm, with two supplementary introduction posts. There’s still a lot more to talk about, but at the request of our readers, I have decided to periodically collect posts together into an omnibus post, so that you the reader can easily access and share them!

Topics we’ve covered to this date at the 101 level include:

At the 201 level, we’ve explored several locking systems and clever configurations:

There’s a lot more yet to come, and remember that the scope of this series is not limited to just the sorts of topics we’ve covered so far, so if you have any suggestions for topics you’d like to see covered, please let us know in the comments below!



Nathaniel F

Nathaniel is a history enthusiast and firearms hobbyist whose primary interest lies in military small arms technological developments beginning with the smokeless powder era. In addition to contributing to The Firearm Blog, he runs 196,800 Revolutions Per Minute, a blog devoted to modern small arms design and theory. He can be reached via email at nathaniel.f@staff.thefirearmblog.com.


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  • Martin Grønsdal

    This is becoming the encyclopedia britannica of firearms.

    • Longhaired Redneck

      Perhaps Encyclopedia Nathanielca would be more accurate!

  • M

    You did short recoil, time for long recoil

    • Yes, long recoil is waiting on appropriate images/animations.

      • Giolli Joker

        It needs more Mars.

      • George

        Oh, I should crank up Inkscape if I get free time…

      • M

        Roller Delayed blowback vs Roller locked is also a good topic. IMO people get confused by both systems a lot

  • Longhaired Redneck

    More cowbell…