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Macc Tecc Sound Moderators

Macc Tecc Sound Moderators

Most of the major rifle importers now seem to feel that offering their own-brand moderator is a good idea and I would agree. Edgar Brothers Ltd have just joined this club with a highly compact, muzzle-mounted design called the Macc Tecc (patented). Solidly built from high quality aluminium alloy it’s designed for full bore use but also works well on 17 HMR or rimfire as necessary. Rather than go for an over barrel (reflex) design Derek Edgar (Edgar’s MD) specified a muzzle can only approach, personally I prefer this type any way.

To keep overall length down when mounted on a rifle the moderator was kept as short as possible. But to keep its sound suppression abilities high it has a wide body diameter. It‘s also a sealed unit that needs little maintenance other than a clean out every now and then to remove burnt powder residue.


Initially the Macc Tecc will be offered in thread sizes of 1/2” UNF, 5/8”x18, M14x1 and M18x1 with any other thread being to special order. My friend and the Editor Pete Moore has a Macc Tec for his 6.5mm range of guns (Grendel, Creedmoor and Swede) cut for ½ x 28 UNEF to illustrate this fact. The size regardless of calibre will also be uniform with dimensions running 113mm long, 44mm in diameter with a weight of typically 215 grams dependant on thread and calibre.

This amazingly low weight is achieved by the all-aluminium construction but having all the crucial internal vulnerable areas thicker to resist flame erosion. It’s a sealed unit which makes it fool proof and when all said and done makes sense as moderators that come apart can become misaligned or thread`s corroded together.

The aluminium used is aircraft grade and looks very uniform so helping with the strength of the unit and durability as well as providing a great surface finish. This is firstly vapour-honed and then hard-anodised in black for an excellent durable surface and is available either all black or black outer with silver/grey ends to suits a stainless rifle.

Furthermore the rear section has been specifically designed with a taper at the rear to deflect reflected light away from the scope thus suitable for when out lamping or when shooting when the sun in low and behind the shooter. A small point but very handy never the less!


As it’s sealed it’s difficult to see the internal baffle system but by peering into the threaded end the guts look very complex. It appears to be one machined CNC baffle stack that is inserted from the front and then sealed with a dished front end cap. At the rear past the threaded section is an initial void of about an inch that forms a blast baffle to catch that initial forward motion of the hot expanding gases. This first baffle is thick so will cope well with repeated fire. Past this is a series of cut rectangular vents in twin sets that progress up the moderator in four layers with the vents orientated to form a stepped or opposing stack.

Edgars sent me a proofed .308 Win ½ UNF threaded moderator which I tried out on a Tikka .308 Win with a variety of ammunition light and heavy bullets, factory and reloads. I also shot it on a .243, .223 and 17 HMR and also a .22 rimfire just to see.

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Firstly a .308 Win makes any sound moderator work hard for its living, Plus you are burning over 45-grains of powder and pushing a supersonic bullet through a small light moderator.

This can cause fast heat up and therefore mirage. Yes like all aluminium moderators the Macc Tecc did show heat haze after 15 or so rounds but that was only a problem during the sighting in process, when out hunting it is of no consequence!


Also being light at 215 grams the point of aim from my usually moderator fitment was an inch left and higher by 1.25”, so negligible. You also quickly realise that its light and compact build makes little to no difference to general gun handling too! For example; it only adds 113mm to a 21” barrel.

I shot light 110-grain V-MAX reloads up to 180-grain factory loads and the hot Hornady Superformance 150-grain ammo and the Macc Tecc performed flawlessly.

Before I go into noise reduction I have used all manner of professional kit for accurate dB recording but these days I compare between existing sound moderators on the market to gain a ‘what you actually hear’ list. When you fire you can really feel the moderator working hard as the muzzle report is a tight strained and quick noise.

Some moderators have a low long ‘phut’, but the Macc Tecc produces a ‘tock’ signature. I swapped over different moderators and to my ear I would place it between an MAE 38mm muzzle can and aimZonic PLUS, so good!

On a .243 despite the larger baffle hole size for this calibre the sound reduction was again very good. Equally a .223 being very mute but you are burning half the power of a .308. It is a bit over the top for a 17HMR and .22 Rimfire but again worked very well so maybe if you just want one sound moderator for all your rifles so long as they have the same thread size and larger calibre hole - the Macc Tecc might be it.


Edgar Brothers are very pleased with the Macc Tecc and the design is patented. Being a non over barrel can it can be used on rifles with front sights without too much work leaving the blade in place. The moderators on rifles as they go through proof will be offered calibre-specific. The aluminium is thick so will last longer than some other alloy cans I have tested and noise reduction is good for its size.

I like muzzle cans and this new mod looks to be another good addition to the British market

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  • Macc Tecc Sound Moderators - image {image:count}

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  • Macc Tecc Sound Moderators - image {image:count}

    click on image to enlarge

  • Macc Tecc Sound Moderators - image {image:count}

    click on image to enlarge