.22 Silencer Design

Phil Dater's R10 suppressor on a Ruger 10/22 (top). Bottom ishisAR7 suppressor on a Charter Arms AR7.

Rifle Silencers Best Design

Phil Dater's R10 suppressor on a Ruger 10/22 (top). Bottom ishisAR7 suppressor on a Charter Arms AR7.

Silencer For Hs2000Phil Dater Suppressor Testing

The M30 totally disassembled. This early model uses commercially purchased spanner wrenches. Dater now builds his own tools for maintenance.

Dater places much of his design emphasis and testing on empirical, subjective judgment about the efficiency and effectiveness of a suppressor. He says. "There is probably too much emphasis placed on the scientific, laboratory approach, especially when field conditions are ignored. People don't use a suppressed weapon in the lab, they use it in the real world.

"However, I asked Reed Knight, a suppressor-knowledgeable expert, to measure my unit. His test jig is a Ruger pistol with a two-inch barrel. I was pleased with the conservative minimum 25 dB drop."

As a new wrinkle, Dater has begun using a computer as an aid in designing and improving his suppressors. He says, 441 have my program almost bug-free at this point. The main thing the computer does is factor in a lot of science and numbers, suggesting suppressor size, baffle numbers and placement in given caliber, barrel length and powder charge/bullet used. These variables seem to be prime considerations in determining gas volume, and I know I am on the right track, as the lower test numbers are there."

He realizes, though, that like the EPA's gas mileage figures for automobiles, the ubiquitous and lab-spawned dB ratings are essential to the commercial comparison of the many available suppressors.

He completed a series of lab tests on several of his screw-on suppressors as this chapter was being written. Dater's instrument measurements are taken at ninety degrees to the side and at five meters distance, except for the .223 and .30-06, when he moved out to ten meters. On his custom design for a Ruger #3 in .223, Dater achieved a 26 dB drop. His custom prototype for a .300 Winchester magnum showed a drop of 24 dB. His prototype M22 suppressor with fifteen baffles, mounted on an Ml6, showed a drop of 25 dB. A custom can on a .223 Sako cuts sound 28 dB.

"I would say that at seventy-five meters my M22 unit is essentially inaudible. If you are using one on an Ml6, you can hear only the weapon mechanism working and hear the round impact seventy-five meters downrange."

The production M22 is designed as a screw-on for a variety of centerfire .22 rifles, including the AR15. M16, AR18 and AR180. With an accessory internal barrel sleeve, it can also be used on the Ruger Mini 14, Ruger AC-556, the Heckler & Koch

HK93, and a wide variety of other .223 weapons. The length of the M22 is 13.25 inches, the diameter is 1.375 inches, and the weight for the standard model is two pounds.

He also redesigned his SM-XM and renamed it the MXM. It's a sound moderator for the XM-177E2. Its mission impossible is to hold down the awesome muzzle blast that goes along with the mighty weapon. "I used stamped baffles in it with some other design changes, and, amazingly, 1 achieved a 19 dB reduction in sound level," Dater relates.

Basically, his MXM is a markedly shortened M22 unit with a single point mount on the muzzle threads. The finished unit is 7.5 inches long and 1.38 inches in diameter.

The R22Mg is an inexpensive muzzle suppressor designed for the American 180 submachine gun. It is not as effective as the integral type AM8 suppressor which Dater custom-designed for the American 180, however.

Dater has now adopted a small .22 to the Walthcr PPK in .22 caliber. He says, "I made up a few of what I call my 'James Bond units' for some customers. The unit is not quite as effective as the can for the Ruger, but close. It makes a good backpacking weapon, by the way."

He is also doing the same basic design for the AMT .22 Backup, using a stainless steel suppressor with a sound level drop that tests at 25 dB.

In addition to his standard items, Dater will custom design and manufacture suppressors for almost any other feasible weapon. He has a scaled-up version of his M22 for various .30 caliber rifles. It's the M30 which is 14 inches long. 1.6 inches in diameter, and weighs 4.5 pounds. He also produces, on a semicustom basis, suppressors for the M3A1 submachine gun, the American 180, the Ruger #1 and #3 rifles, Thompson Contender models, and various other weapons.

Dater's order file really began bulging after Soldier of Fortune magazine ran a colorful article alliteratively titled "Doc Dater's Deadly Devices." Dater smiles and says, "Yeah, the writer who did the piece was so impressed that he ordered some units for himself, and apparently the word went around the circuit that folks who wanted one of my suppressors had better get their orders in early. It was quite a pickup for my ego and my business ledger."

A later article in SWA T magazine, which Dater

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