The terms “firearm silencer” and “firearm muffler” mean

​18 U.S.C., § 921(A)(24)

1.  any device for silencing, muffling, or diminishing the report of a portable firearm,

2.  including any combination of parts, designed or redesigned, and intended for use in assembling or fabricating a firearm silencer or firearm muffler, and

3.  any part intended only for use in such assembly or fabrication.  See also suppressor.

4.  Any device that meets the definition as stipulated above in 18 U.S.C. § 921(a)(24) is also subject to controls of the National Firearms Act 26 U.S.C., Chapter 53.

Suppressors are typically constructed of a metal cylinder with internal devices (Baffles) that reduce the sound of firing by slowing the propellant gas and and allowing it to cool.  

There are three sources of sound when a firearm is discharged:

1.  Muzzle blast (high-temperature, high-pressure gases escaping after bullet)
2.  Sonic Crack:  the sound associated with shock waves created by an object exceeding the speed of sound.  

3.  Mechanical noise:  The moving parts of the firearm i.e. the moving bolt or slide.

A suppressor can only affect the noise generated by the one primary sources—

1.  muzzle blast

Sonic Crack - The use of subsonic ammunition can negate sonic crack.  

Mechanical noise can be reduced but is nearly impossible to eliminate.

Silencers and Suppressors:  What they do and Why we need them!

Contact Information

If you are interested in a NFA Trust and how you can legally purchase NFA regulated items, call me or email me and i will be happy to tailor a trust for your specific needs.

Telephone:  281.451.4175
FAX:  713.513.5918
Postal address:  505 N. Sam Houston Parkway East, Suite 515, 
                           Houston, TX  77060
Electronic mail
General Information:
Consult with Attorney Sean Cody for NFA trust: 

Maxim Ads from the early days of Silencers.

Reasons to own a Silencer:

The Number one Reason:  Its none of your business!  But Seriously, there are some great reasons to own silencers!

1.  Greater Safety:  Communication, communication, communication.  

​2.  Happier Neighbors: Lower noise footprint from shooting activities at local gun clubs or shooting on your own property.  They make shooting more enjoyable and less offensive to others at the range

​3.  Ethical Hunting:  Less noise footprint on the animal population

​4.  Effective Defense: You won't damage your ears or you family's ears if you have to shoot to defend yourself and your family.  They don't alert one to your location as easily as an unsupressed firearm.

​5.  Enhanced Accuracy: Less Recoil, Less Noise, Better Barrel Harmonics, Suppressors can increase muzzle velocity and terminal ballistics of a rifle.

​6.  Compliance with local Noise Ordinances:  ensure that no noise ordinances are violated if you're shooting on private property.

7.  Health: EXTREMELY loud noises cause permanent hearing damage!

​8.  Reduced Flash Signature:  With most normal powder loads, suppressors contain most of the muzzle flash and allow shooters to maintain their night vision longer than with un-suppressed weapons.

9.   Reduced Physical Signature:  Suppressed light and noise and the alteration of the frequency of the muzzle blast make direction finding much more difficult than with non-suppressed weapons.

Texas NFA Gun Trust in Houston and Across the State of Texas!!

Silencer Terminology 

Silencers consist of a few basic parts.

1.  Tube:  The envelope is the cylindrical metal tube in which the other components are stuffed.

2.  Expansion chamber:  The area within a silencer that allows hot gases to expand and cool.  

3.  Baffles:  usually circular metal dividers which separate the expansion chambers. 

4.  End Caps:  

5.  First round pop:  Usually, much higher sound pressure levels are generated by firing the first shot through a silencer. The “Cold Shot.”  Often abbreviated as “FRP.”  FRP is caused by the silencer being full of oxygen that is ignited by the hot gasses entering into the silencer.  Afterwards, the oxygen is depleted and subsequent shots (if fired fairly quickly behind the first) are quieter.  

6.  Nielsen device:  Recoil Boosters (Nielsen Devices, ND) are used to help recoil operated firearms (Pistols and/or Machine Guns) to cycle properly when a Suppressor is attached to the muzzle.  the weight of the suppressor can be uncoupled from the barrel at the moment of firing, allowing the pistol to function properly by boosting the recoil energy of the barrel and slide, and by temporarily decreasing the effective attached weight. 

7.  Wipe Design:  Wipes are inner dividers intended to touch the bullet as it passes through the suppressor, and are typically made of rubber, plastic, or foam. Each wipe may either have a hole drilled in it before use, a pattern stamped into its surface at the point where the bullet will strike it, or it may simply be punched through by the bullet. Wipes typically last for a small number of firings (perhaps no more than five) before their performance is significantly degraded.  

8.  ​Integral Silencer-  A silencer that is integrated onto or into the weapons barrel and generally cannot be removed. Integrals are normally built by drilling holes into the barrel and adding a baffle stack at the end.

9.  End Mount/Muzzle Silencer:  A silencer that is attached (normally by means of threads or quick attach couplings) onto a firearm. 

10.  Direct Thread or Mount:  A silencer that threads onto the muzzle of a firearm.

11.  Overbored:  the term referring to a silencer that has had the area where the bullet passes through opened up to a larger dimension than is typical for the specified caliber so the silencer can shoot a larger caliber.  This is also done to prevent baffle strikes on weapons subject to large amounts of full auto fire.  Overboring a silencer causes it to be louder than if it were left to a smaller diameter.

12.  Ablative Media:  Generally means a silencer coolant such as water, gel, or some other form of artificial coolant.

13.  Dater hole:  Hole or holes drilled into the baffle to jet gas for sound reduction.  Credited to Dr. Philip H. Dater of Gemtech

14.  Shooting Silencer Wet:  Refers to putting water or similar coolant (Ablative Media) into a silencer to reduce sound levels.  Wet silencers are generally quieter than dry silencers.

15.  Dry silencer:  A  silencer that is not fired with ablative media in it.  Generally Rifle Suppressors re not shot wet. 

16.  EDM:  A wire EDM machine is used to ensure that the bore is concentric to the mount and exactly the right size to prevent baffle strikes.  Electrical discharge machining (EDM), sometimes colloquially also referred to as wire erosion, is a manufacturing process whereby a desired shape is obtained using electrical discharges.  A wire is dropped down the bore. The wire (usually made from special brass) is tensioned between rollers that supply a constant feed of wire. Somewhat similar to a band saw without reusing the wire. An electrical current is passed through the wire and it's then swept in a circle. This arc's it's way through the metal cutting the bore to the correct diameter and ensuring it is concentric with the mount. 

17.  K Baffles:  Baffles that are shaped much like the letter K.    K forms slanted obstructions diverging from the sidewalls, creating turbulence across the boreline

18.  M Baffles:  Baffles that are shaped like the letter M with the M on its side.  M-type is the crudest and composes an inverted cone.

19.  Omega Baffles:  Patented baffles that were developed by Joe Gadinni and used by SWR Manufacturing.  Some other silencer companies used licensed versions of this design.  Omega forms a series of spaced cones drawing gas away from the boreline, incorporates a scalloped mouth creating cross-bore turbulence, which is in turn directed to a "mouse-hole" opening between the baffle stack and sidewall.

20.  Z Baffles:  Z is expensive to machine and includes "pockets" of dead airspace along the sidewalls which trap expanded gases and hold them thereby lengthening the time that the gases cool before exiting.

21.  Monocore Baffle:  monolithic core is one solid piece of metal which has had sections machined out of it or sometimes created through casting.

22.  ​Stacked Baffles:  Stacked baffles are a series of individually created baffles which are stacked together to create the core. 

23.  Slant Wall Baffles:  Baffles that are slanted inside the of the silencer at various angles. 
24.  Quick Detach Mount or more accurately Quick Attach Mount:  An abbreviation for “Quick Detach” mount.  Slip on Bayonet style, thread on with mechanical latch, etc.

25.  Baffle Erosion:  Propellant gas heats and erodes the baffles, causing wear.  The wear is worsened by high rates of fire. Aluminium baffles are seldom used with machineguns or Semi automatic centerfire weapons, due to unacceptably short service life. Modern suppressors using steel or high-temperature alloy baffles can endure extended periods of fully automatic fire without damage. 

26.  Baffle Strike:  When a bullet hits the baffle it is what is known as a "baffle strike"

27.  Spacer:   Spacers separate baffles and keep them aligned at a specified distance from each other inside the suppressor. Many baffles and spacers are manufactured as a single assembly and several suppressor designs have all the baffles attached together with spacers as a one-piece helical baffle stack.


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Sean Cody