American 180 Submachine Gun With Silencer

American 180 Submachine Gun
Ml A/Ml4 suppressor. Same features as AR15/M16 uni:
M16 Laser Over Barrel

American 180 suppressor/barrel assembly with laser sight mounted.

The Ciener suppressor on an Ml4 with bipod.

American 180 Submachine Gun Magazine

m 30

m 30

Firearm Gun Silencer

results with light, porous materials to slow and cool the expanding gases. Porosity is necessary to allow the lead and powder residue to dissipate.

"Due to the high pressure associated with them, larger caliber suppressors require materials that sustain higher energy levels. Suppressor designs for these calibers must take this into account. Here it is necessary to capture the energy pulse and use it against itself with the confines of the suppressor. To do this, we reverse the direction of the pressure pulse, thus much of this pressure can be "trapped" in a holding chamber and released gradually as the pressure in the recirculation area lowers."

Ciener adds, "This technique requires the greatest precision in machining tolerances, as the center hole the bullet passes through needs to be as close to the bullet diameter as practicable. This traps the gases behind the bullet forcing it into the suppressor design."

Where this suppressor designer is concerned, the machine tolerances aren't the only critical element. Ciener is as critical of the work of others in his field as he is exacting with his own. He says of suppressor technology that "while the basic technology of firearms suppression has been around now for seventy-plus years, recent developments have come in three forms: new internal materials; recombination of known techniques; and gimmickry."

He speaks with disdain of the last one, saying, "Gimmickry is apparent to me in some of the most publicized recent designs. The spiral diffuser that has enjoyed recent popularity is one example of this. The speed at which the pressures inside a suppressor move most certainly counters the theory of forcing the gases against each other. The spiral design would only work in a longitudinal direction, i.e. front to rear and then back. What is needed is a swirling motion to keep the pressure waves directed away from the muzzle outlet.

"The second gimmick is the so-called pressure relief valve. This consists merely of an outlet in the suppressor that has some holes in it to restrict the exit of the gases to the atmosphere. To be effective, it must have some form of retention system until the pressure is reduced.

"In our tests the same unit without a relief valve was quieter than with and a unit fitted with an extra valve was louder. Also, in our night tests, there was a definite fireball at the valve."

A third gimmick which Ciener feels is less than useless is the muzzle wipe, a bit of 1960s silencer technology in the form of a rubber disc whose function is to close the center hole of the unit after the bullet passes by, thus shutting off escape of gases.

"The much-believed idea that this wipe has any effect on the velocity of the projectile has yet to be demonstrated to my satisfaction," he says. "Actually, the wipe has been shown to be detrimental to the accuracy of the weapon. It rapidly deteriorates as the suppressor is used, which then deflects the trajectory of the projectile. This is of

Silencers Submachine Guns
Jonathon Ciener with a Stoner conversion, firing the Ciener suppres sor.

little concern in full auto fire, but in the semi-auto mode, accuracy will be very poor, making an 'open bolt* firing weapon, already inherently terrible for accuracy, even more so.

"In high-velocity, long-range shooting, any contact with the bullet after it leaves the rifling will affect the accuracy adversely. Trajectory is so adversely affected as to render the rifle worthless. So, as the exit hole in the muzzle wipe is rapidly enlarged through wear, any advantage in sound suppression is quickly diminished."

Yet. this outspoken designer is impressed with much of the new technology and feels that space-age thinking and materials will be the next benchmark in silencerology.

He says, "New space-age, nonresilient rubber, nylon, and plastic derivatives that have enhanced sound absorption and heat retention are coming forth from our scientists in the space program. As with other industries, we suppressor designers need to apply these new developments to our needs.

"The materials we currently use have the drawback of limited life they rapidly deteriorate. For military applications, this is acceptable. As the effectiveness diminishes, after a certain number of shots the individual military user has an insert pack that brings the unit back to its original effectiveness. Depending on the ammunition used and rapidity of fire, this can be as little as five shots. For commercial sales applications, this is not as favorable.

"Who knows what materials exist or are soon to develop that will both be effective and offer

Uzi With Suppressor
Always a popular weapon, the Israeli Uzi goes very quietly with the Ciener suppressor.
American 180 Submachine Gun
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