I went with the M4-2007 for my 10.5" LMT…
There are some charts out there. I think as long as you stick with a can made by OPS, Gemtech, AAC, SF or SWR, you will be GTG…
As Shivan said, each can will sound different to you and will also depend to a certain point on which ammo you use.
C4
I agree completely and think on an 10.5" SBR the most important features in order are:
- Weight savings to maintain the handling characteristics.
- Length to again maintain handling in tight quarters.
- Durability, as the 10.5 really beats on a blast baffle
- Mount POI repeatablity and sturdiness.
- Sound, most people will use these SBRs for home defense, and any can will be loud in your house no matter what.
This is what people mean when they say “buy the features that you want”. I would only use a SF556K or 416-SD for a 10.5" AR based on MY requirements.
I barely notice the can is even on, 15oz. is LIGHTWEIGHT.
I think you forgot one… KAC.
I’m quite happy with my NT4.
Check Ops Inc for their line of LE and military suppressors. They are one of the best out there, though probably expensive. Their cans push the freq’s higher, above normal hearing range. They’re made of stainless steel and you can easily add/remove water to increase noise reduction. I think they’re guaranteed past 50,000 rounds.
Gun shot noise is broadband. I have seen it many times on a spectrogram and have published many 3D spectrograms of gunshot sounds. There are none I have found which mostly have ultrasonic energy and none which seem to shift frequency upward. There are some which attenuate lower frequencies more than higher frequencies, but this is not the same as frequency shifting.
My comments about Ops Inc. Frequency shifting came from what I read about their product. I will gladly yield to the experts on this forum, but I would like to know what experience anyone here has had with the Ops Inc product, pro or con.
I have had a 15th model for about a year now. Its been mounted on a 12.5 barrel, and its been through the paces.
First thing people say when they shoot the rifle is that they are surprised by the recoil reduction, and how smooth it operates. The muzzle is very easy to keep on target for follow up shots. It is comfortable to shoot indoors and out doors with no hearing protection (if you value your hearing, do not do this for sustained amount of time). It really tames the 12.5 barrel, while still balancing and not causing the rifle to be uncanny to handle
The mount is rock solid when everything is tightended, it is a very simple design yet really ensures everything is very concentric to the bore. Im not big into the “quick detach” mounting systems, I personally have no need for them, so I like having dedicated suppressors for each rifle, different purpose, different “mission”, different needs/wants we all have…whatever floats the boat
It puts my 12.5 barrel just around 17.25 inches OAL, weighs somewhere around 17ounces I believe.
I have an OPS .308 3rd model sitting at the SOT right now waiting for the form 4 to get back…im a repeat customer 
Good job on asking questions and researching what you want, and I agree with Shivan, try to hear what you want to buy before you buy it. I am a “total company” type of customer, I choose to support companies based on the entire product line and their company stance. There are companies out there that will never see my $$$, and there are companies that will see my continued $$$ because they make a great product and support their customer bases.
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