Thursday 16 February 2017

Silent Handgun Cartridge Patent - Captive Piston:

The American Military have made them, - and The Russians (& USSR) also have them.

I have designed and patented such a cartridge for standard unmodified handguns:

Both nations used the system of a CAPTIVE PISTON CARTRIDGE - The US's being a small shot-shell firing 15 balls - while the Russian guns use a single heavyweight projectile.
It is possible to design and produce a handgun system that fires VERY quietly .. having only the sound of the guns mechanical action and firing pin strike.

You do not need a bulky screw-on 'silencer'.

NO Noise
NO Blast
NO Flame
NO Flash
Russian OTs 38 and Two Rounds of SP-4 Captive Piston Ammunition
Link :

USA QSPR - 'Quiet Special Purpose Revolver' & Cartridge
 - Modified S&W by AAI.

The Russians have also adapted multi-barrel handguns and semi-auto pistols to use these captive-piston cartridges.

This technology is a proven & working reality - it is not science-fiction.. this is fact.

A major issue with both of these existing military special purpose firearm systems is the non-standard form of the cartridges and the expensive specially made firearms to use the silent ammunition.

My design or invention incorporates elements from previous designs into a new production design cartridge in various calibers that will fit into existing handguns such as 357 Magnum..

The above images are from the patent documents.

Key features are the piston retaining 'shoulder' formed over a steel annular ring, the stepped diameter projectile, and the polymer piston material formulated to slowly release the retained pressure after firing.

A secondary feature is that the "quietness" may be adjusted to an acceptable loudness level if 'silence' is deemed unlawful (- by use of a secondary primer inclusion).

This 'safety' cartridge will help eliminate flinching by shooters. - 80-85% of all US police shots fired miss their intended target.

The sub-sonic bullets may be produced lead-free & frangible if desired.

No US ammunition maker approached has indicated interest. - In fact - no US manufacturer has even had the courtesy to respond to my letters detailing & including this patent.

- Any ideas out there to help progress this design? - Interested?

Marty K.
After researching & writing 1,036 blogs I've got something NEW to try .. I've signed-up to Patreon. - In over five years I've not made one cent from this .. NOW you can send me a wee support $ - starting from $1. to get all this stuff from New Zealand - over a year that's nearly the price of one Shooting magazine. - Am I worth it?


  1. Great project, especially your clever idea of the steel ring supporting the case neck! The microporous piston to gradually let off the pressure is also a great solution to the hazard left over from American and Soviet systems -- not that reloading was ever a concern in those cases.

    Don't think this will take off in the USA as the QSPR cartridges are on a banned list there and so require a six-month wait silencer permit. As for NZ Police they no longer use revolvers, so that's out too as a market. Like most great inventions it falls down for lack of a market.

    One thing I thought of was allowing indoor shooting without the need for using extractor fans because of lead dust from lead styphnate primers. But wax bullets with "green" primers could also fill the lead dust free niche. Our police could do with a safe way to practice point shooting etc without needing an organised range trip with their arms officer. Some only go once a year.

  2. All valid comments so thank you. If the US passes their silencer / hearing protection act things could possibly change quickly ?..

    1. The poor deaf americans, yes.

      For now, for poaching and such illicit applications cat's sneeze loads have the niche. As for real non-Hollywood assassins, they use knives, thallium laced sushi and cyanide sprays.

      It will be a while before US legislators stop getting their knowledge from Hollywood and so your useful invention will be forever needing that big tax stamp. Who knows, maybe you need to sell each cartridge with its own serial number with a tax stamp for each one, or one number shared by a set of six. You'd need to make them reloadable in that case, stainless steel as after there is no need for brass as the neck does not need to expand and seal the breech. Remember the Brocock cartridges?

      I muse, if the 'piston' has an integral primer extraction pin in its base you can depress the piston once the cartridge is depressurised and so push out the primer and reinsert a fresh one to reload cartridges powered by primer only (unless you also use a very fine powder which you can trickle into the cartridge via the primer hole).

    2. - Some good thinking going-on there for consideration.
      In the full patent 'art' I have provided for a noise-making second primer to be included with the projectile - open to atmosphere .. thereby the rounds might NOT be classed as "Silent" but merely quiet .. I reckon that all things are possible - given the will. Cheers I value your interest.

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