Japanese Hino Komuro 1908 Blow Forward Pistol

My mind = blown:

The design has no locking mechanism, and it is just inertia of the barrel traveling backwards that holds everything together until the bullet leaves the muzzle (as with any blowback design). The recoil energy from the shot has no way to push the breech of the gun rearwards, and so instead it acts on the barrel, pushing it forward against the recoil spring until it locks in place, ready for the next shot.

When he pulled that barrel forward in the video I was like =)

What a neat design, very simple too.  I had no idea this even existed.

You can read more about it on Forgotten Weapons.

Hat tip: Anders



Ed March 1, 2012 at 01:09 am

This is amazing. It’s also a good illustration of why people like me should never come into an exorbitant amount of money. I’d buy up all these crazy awesome old designs.


Poppy March 1, 2012 at 01:17 am

It looks really brittle, even more so than the Nambu (which I thought was impossible).


Ed March 1, 2012 at 01:30 am



Vhyrus March 1, 2012 at 01:25 am

since it recoils forward it must have almost no muzzle flip. I wonder how reliable the feeding on that gun is. Add another piece to my memory collection of ‘guns I have to replicate before I die’.


Tekkie March 1, 2012 at 07:38 pm

That is likely true, however, there would obviously be mechanical movement of the cartridge slamming against the firing pin before the round left the barrel. Thus possibly affecting the sight picture.

Regardless, terribly interesting. I would love to see it fired.


Vhyrus March 1, 2012 at 10:31 pm

my guess is that the barrel movement is negligible since most of the felt recoil comes from the gunpowder ignition rather than any mechanical motion. I would have to fire one to be sure though.


flowmaster March 1, 2012 at 04:15 am

Wow, I thought the Frommer Stop was a really out there design. This takes the cake.


Hrach Hayrapetyan March 1, 2012 at 07:52 am

Guys, just visit forgottenweapons.com …there is a lot of interesting stuff there like this one!


Dave March 1, 2012 at 08:07 am

Ha, imagine gun history if that was the “1911” of the last century.


Bear March 1, 2012 at 08:21 am

Is it just me, or does recocking or clearing a jam from the front of a potentially very hot barrel sound a little awful?


Mike March 1, 2012 at 10:18 am

“What appears to be a barrel up here is actually just a [shoulder thing that goes up]”


45er March 1, 2012 at 07:32 pm

“Grossly impractical, but just really cool”

If that doesn’t define the gunny attitude, I don’t know what does. That’s pretty sweet.


Critter March 1, 2012 at 08:32 pm



Jwhite March 1, 2012 at 09:16 pm

The japanese sucked at making guns. Pretty cool gun though.


Jwhite March 1, 2012 at 09:18 pm

This guys video could put me to sleep.


Weer'd Beard March 1, 2012 at 09:27 pm

Appears to technically be an “open breech” gun, which by dumb BATFE laws it would be a “Machine gun”


Vhyrus March 1, 2012 at 10:10 pm

Probably has a C & R exemption on it.


dave March 3, 2012 at 03:55 pm

I like it, instead of, ‘how do we get the cartridge into the barrel’ its ‘how do we get the barrel around the cartridge’


Federale March 3, 2012 at 07:37 pm

When does FPS Russia test fire one?


Poppy March 3, 2012 at 08:04 pm

When it’s featured in the next Call of Duty.


Jennifer March 4, 2012 at 09:12 pm

Very interesting. Impractical, but interesting. I would have begged for a chance to shoot it.


Jeep March 5, 2012 at 09:12 am

I’d be really really interested in seeing a whole magazine (or clip? ya never know with those crazy Japs ;-) ) fired from this pistol, I wonder how it cycles…

I think what makes it impractical is the lack of trigger protection. It must be very tricky to put it in a holster, and pull it from there !


Jeep March 5, 2012 at 09:13 am

And the overall design is SO cool, so thin and… aerial.


el jefe December 5, 2012 at 08:52 am

Momentum, not inertia.



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