SUPPRESSOR SELECTION

You have really two choices to select from when you purchase a suppressor; a thread mount "muzzle" suppressor (can), or an integrally constructed suppressor where the can is built back over the barrel of the gun.

Some handguns like the Beretta 92, and Browning Highpower must use muzzle cans, as there is no other way to suppress them. Most rifles can have either muzzles cans, or be integrally suppressed, as can some pistols like the Ruger MkII, Browning Buckmark, Hi-Standard models, and Colt Woodsman, and Thompson Contender.

A removable muzzle can allows you to swap the can from gun to gun in same, or lesser calibers, as long as the muzzles are all threaded the same, but at the expense of added overall length to the gun.

An integral will always be quieter than a muzzle can assuming both are from the same manufacturer, as the barrel can be ported to vent high velocity gas into expansion chambers, and then bleed the gas out slowly to the atmosphere. Typical examples of integral rifle applications are any bolt action rifle, and most any AR/M-16 style rifle. This allows a shorter overall package, but it is a permanent modification, you can't just remove the suppressor and go back to unsuppressed shooting.

Suppressing high velocity/high powered centerfire rifle cartridge, whether muzzle or integral, does nothing to silence the ballistic crack the bullet makes as it travels downrange  far in excess of the speed of sound. It will remove most of the muzzle blast, which may let you shoot without ear protection if the db reduction is great enough, and will cloak your location from any outside parties, as they will hear the bullet, but it is difficult to tell where exactly the shot originated.

Integrally Suppressed .22 Firearms:

There are several things to consider when selecting  integrally suppressed firearms, whether it is a Ruger MkII, or any other integrally suppressed .22 caliber gun.

 Ported barrels are used when maximum sound reduction is required. Some bullet velocity is lost, but if you select a well made gun, with proper porting, the velocity loss is minimal, but sound reduction is greatly improved.

Our ported barrel guns have the highest muzzle velocity in the industry.

Improperly designed ported barrel guns will usually not cycle when shooting high velocity, or standard velocity ammo, and certainly not cycle when shooting subsonic ammo. Well designed integrally suppressed pistols will cycle all ammo, including subsonic, yet provide better sound reduction than poorly designed guns that will not cycle any ammo. Many ported barrel guns lose so much bullet velocity from poorly designed porting, that you may be better off with a Crossman pellet rifle for serious pest removal applications.

Always ask if the gun you are looking at will cycle standard velocity, and subsonic ammo. If you get an answer like "our customers prefer to shoot only CCI mini-Mag", or  "we recommend only Remington high velocity ammo" is a real good tip off that the manufacturer killed the bullet velocity to get decent suppression, and the gun won't work reliably with anything else.

Our guns cycle all ammo, High velocity, standard velocity, and subsonic **.

Lets look at a comparison of the Sound-Master MkII and competitors product "A".

The Sound-Master metered 116 db with Remington Hi-vel ammo at 1040 FPS, 111 db with CCI Std vel ammo at 910 FPS, and 109 db with Remington subsonic at 820 FPS on one particular day. The Competitor metered 115 db at 910 FPS with Remington Hi-vel ammo, and wouldn't reliably cycle CCI std vel ammo at 112 db at 760 FPS, and would not cycle at all the Remington subsonic at 110 db at 600 FPS.

If you put the two guns side by side, you "might* hear the competitors gun is 1 db quieter shooting Remington Hi-velocity, but it  has a lot slower bullet. Or you just take the Sound-Master, shoot CCI std vel ammo, and you now have the same bullet velocity (910 FPS), and the Sound-Master is much quieter than the competitors gun comparing bullet velocities. You, with the Sound-Master have the choice of selecting the proper ammo for the occasion; casual plinking, or ultimate stealth. The owner of the competitors gun is stuck with just high velocity ammo, unless he wants to manually cycle the gun all the time.

Another consideration is whether you want a stainless steel gun, or a blued/parkerized gun. Stainless is a must for use of water as a suppression enhancer, and desirable for ease of cleaning in general. Blued or Parkerized guns are desirable where the reflectivity of stainless steel would be a liability.

Another important consideration is whether of not the suppressor removes from the gun for cleaning. Obviously, a .22 caliber suppressor the can be easily removed by the owner, will last a lot longer that one that is permanently fixed to the gun. If the suppressor does not remove from the gun, make sure that the expansion chamber area around the barrel has some method of draining cleaning solvent from the chamber. A non-drainable, non-removable suppressor, quickly become clogged, and useless, especially considering how dirty most .22 ammo is. At $200 for the tax stamp, plus the cost of the gun, I am sure you don’t want to throw your gun away after 5,000 rounds or so because the suppressor has become clogged, and quite loud. Well designed guns with removable suppressors have a good indexing feature that allows the suppressor to be aligned properly on the gun each time it is removed.

Our tensioned barrel design promotes ultimate accuracy.

We, at  SRT Arms Division, offer  Ruger MkIII’s, in both stainless, and blued steel. All of our suppressors are designed for easy removal from the gun, and offer the best suppression currently available.

Barrel Threading and Muzzle Cans

Obviously, a screw on muzzle can has to attach to the barrel somehow. This means a threaded barrel is required either for the can to screw directly on to the barrel, or to screw on a quick attach coupling device for the suppressor.

On a gun with a factory flash hider, like an AR-15 or M-16, threads already exist. If threads are not present, then the barrel must be threaded.

You should always have the manufacturer of the suppressor do the barrel threading if it is required, so he can guarantee alignment/straightness of the threads, and be able to warrantee the suppressor. Threads MUST be turned on a lathe; the threading *kits* sold to do-it-your-selfers will result in non-concentric, non parallel threads, and cause bullet/baffle strikes and damage the suppressor. If your suppressor manufacturer can't or won't thread barrels, he shouldn't be in the suppressor business.

We offer barrel threading services at a reasonble price, which ranges from $50 to $125 depending on the complexity of the job, and whether or not a thread protector must be supplied to cover the threads when the suppressor is not on the firearm.

Myths and Reality

A suppressor does not make a gun absolutely quiet, no matter what someone may have said once.  Suppressor designs have progressed to the point that a good suppressor is almost *Hollywood Quiet*, at least with subsonic low power ammo like .22 RF and in some cases, larger subsonic pistol calibers. If anyone tells you: "all you hear is the action noise", they are either exagerating; or they are deaf.

A good suppressor allows you to HEAR the impact of the bullet on the target and HEAR the noise of the action cycling, (if for no other reason, the action is often right next to your face when sighting the gun, and since the muzzle of the gun is farther in front of you, it sounds diminished to you, the shooter). But to a person standing to the side, he will hear some muzzle report, though it does not sound like a gunshot, but rather just a  fast whoosh of air, when using a good suppressor.
 

Some may think a bolt action gun, say a Ruger 77/22 is quieter than a semi-auto 10/22 when both are suppressed. To you, the shooter, the 77/22 is quieter because you don't hear the bolt slap right next to your ear, and you don't hear any gas escape out the open ejection port during cycling as with the 10/22. But, If you are standing 50 feet away, the guns sound identical, as the suppressed muzzle report is just slightly louder than the semi-auto action.

What a good suppressor does allow you do is shoot comfortably without using ear protection, alters the sound of the gunshot, so it sounds like *something*, but not a gun, and greatly reduces the distance at which people can hear you shooting.  An unsuppressed .22, for example, can be heard for up to a mile, a suppressed .22, can  often not be heard 50 yards behind the shooter, and only somewhat further to the side.

Decibels, or db, What Do They Mean To Me?

There has been a proliferation of highly affordable sound suppressors, some of which work well and some of which have really poor performance.  With rare exceptions, few have been measured for suppressed sound levels.
 

There are those that say that actual reduction (or absolute sound level) measurements are not meaningful and that all that counts is the perceived loudness. Nothing could be further from the truth, and believing this fallacy can lead to significant hearing loss. Perceived loudness depends on two factors: the frequency of the sound itself and the observer's existing degree of hearing loss. Regardless of how quiet something sounds, significant hearing damage can be sustained by gunfire. Further, hearing damage is caused by more than just gunfire, and the dose is cumulative. Other sources are industrial noise, wind noise (motorcycles, driving with the window open), entertainment, etc.
 

Both OSHA and MIL-STD-1474D state that hearing protection MUST be used if the sound pressure levels of firearm noise are 140 dB or greater. This is specified in Requirement 4 of MIL-STD-1474D. While it is true that a sound level of 145 dB is not nearly as harmful as one of 160 dB, exposure will still cause damage. Once the damage has occurred, it is forever and will not come back. Further, MIL-STD-1474D has specific requirements for metering equipment, which eliminates the Radio Shack types of meters.
 

The standard location for sound measurement is 1 meter to the left of the muzzle at 90 degrees to the bore axis and 1.6 meters above grass. This is the location that most  in the US use. A second location, which is used to simulate the shooter's ear, is 1 meter from the muzzle at an angle back from the bore axis of 45 degrees.  Experience shows that this second location is 1-2 dB less than the one at 90 degrees. When measuring actually at the shooter's ear location, there is too great a chance for some shadowing by portions of the shooter's head, and drops of 4-5 dB suggest that this has happened. Regardless, the OSHA and MIL-STD requirements are for sound levels measured at the specified locations, not some other location.

There are also some so-called independent websites that claim to test suppressors. Take these sites with a grain of salt, as they do not use Mil-Std 1474D test protocol, and use the wrong testing equipment. In some cases, the test results have been changed after the original posting, for whatever reason. In other words, they are not trustworthy results, and produce wildly incorrect db readings that no one else in the industry can duplicate.

ALL of our suppressors, including the .223 and .308 cans measure well below the 140 db OSHA allowable limit for gunshots. If a suppressor manufacturer can't prove their product is below 140 db, , you are possibly putting your hearing at risk.

SRT sound tests and sound measuring equipment comply fully to MIL-STD-1474D.

(Special Thanks to Dr. Phil Dater of Gemtech for his work, insight, and dedication to education about sound testing, and hearing loss,  from which he has allowed our use of his research as written in the section above)
 
 

 You Get What You Pay For, To A Point

A suppressor is a considerable investment; especially considering the extra $200 for the tax stamp, and the work involved with getting a CLEO signoff, and doing all the paperwork. There are a few suppressor manufacturers out there offering product that is priced at 20% to 30% the going rate from a major manufacturer. After you look around, you will find that most of the major manufacturers are usually priced within 20% of each other, with a few suppressor manufacturers offering product much cheaper,
and some that are mighty proud of their products.

There is a reason for this: Inexpensive product is either loud, very large dimensionally, or made of inferior materials like muffler tubing, fiberglas stuffing and freeze plugs, and the inexpensive manufacturer has no access to testing equipment to actually verify the performance of a product. They also typically are in business for only a few years, and after they found out they haven't made any money selling stuff cheap, they go out of business---usually taking a lot of deposits from customers who will never get their product, along with them. On the other hand, some manufacturers that price their MkII's, for example, at over $1000, are either paying for a lot of fancy advertising with your money, or they really don't want to be bothered with making MkII;s, and figure if you want to pay a premium for something that isn't any better than the midprice manufacturers offer, they will be happy to take your money.

Buying the right product the first time,  means much better long term satisfaction.
We have been in business over 15 years, and offer quick turn around on your order; no need to wait for many months,  years, or possibly forever to get your purchase.

We offer a lifetime materials and workmanship warranty on our suppressors, which means if anything fails, we fix it free. If something beyond our control happens, like someone tries to shoot a 9MM slug through a .223 can, or the can is run over by a truck, we offer inexpensive repair or replacement. Repairs are typically $75-$125;  a complete replacement, with the same serial number on a new tube (we can only do this with cans SRT made), is in the $200 range, depending on the can. This helps protect you, and helps cover our material costs, and saves your tax stamp.

Summary

We hope you appreciate us giving you the straight scoop. No fancy sales come-ons, no hyperbole. We just want you to be happy with the product you select, and to know it's uses and purposes. If you have any questions, please contact us, we will be happy to go over your suppressor requirements with you.
 
 

** Some Federal ammo, and some Winchester ammo uses a real slow burning powder that won't cycle any short barrel gun, ported or not. For that reason, we recommend all Remington,  all CCI, and many specialty subsonics such as RWS for use in suppressed guns, ours or anyone else's, as they burn cleaner in a suppressed firearm.