I understand.
The reason I’m asking is I have one rifle that has a Blackout and the other has a Brakeout Comp. Just curious as to what mount you guys were using. Fishing for info.
They should all be the same in terms of shift.
Thanks Jason that’s what I was hoping to find out.
I’ll eventually see for myself once my ATF wait is over. Just curious if anyone had any experience with this.
To be clear, the different mount types should not influence shift ON A GIVEN RIFLE… If you have one rifle with one type mount and another with a different mount, they will most likely have different but similar shift with the same can.
Is there a point with current suppressors where the extra weight would cause a problem to lightweight barrels? For instance, would hanging a 762-SDN-6 off a 16" SCAR pencil barrel cause issues other than potentially more shift than a lighter can?
Generally (I have to say that, because it’s never certain to 100%), a lighter and longer barrel will give you more shift. It will still be repeatable every time you mount the can however.
ETA - As far as it being a problem, I don’t think so. We’ve run 'N-6’s on the end of a lightweight 20" gun and not had problems. There is however a point where it gets pretty ungainly to have that length and weight out there…
Hey markm, completely off topic, but how much of the barrel does the M4-2000 suppressor cover when mounted?
If one were to build a SBR using a 11.5" barrel, would it be possible to have a 11’ FF handguard and still mount the suppressor? Or does it depend on the FF handguard?
The M4-2000 sits about 1/8" behind the mount. I have about 1" of space on my 10.5" MRP (9" rail). As long as the rail leaves a litte barrel showing past the threads you should be ok.
Thanks Vinson, if I ever get my paperwork turned in, I want to do a 11.5" with a 11" VTAC/Troy Extreme. It sounds like most people agree that the M4-2000 is the way to go for suppressors.
Markm, was the can tight solid for this, or tightened down and then backed off one notch per aac recommendation?
Cans were all fully tightened.
Is this correct for the M42000?
Seems like it’d be hard to back it off 1 notch on the 51t mount, but I could understand it on the 18t mount.
From John Hollister at AAC:
Typically where there seems to be an issue is not the silencer in a valley between the two last teeth, it is shooters typing to muscle the silencer over the very last tooth to try and tension the silencer. The 51T mount is not a tensioning system, it is a retention system.
When you muscle the silencer and get it to “stick” you are actually just catching the latch on the 45degree face of the next tooth. When the first round is fired the latch drops back into the valley and subsequent shots group nicely. Again, typically shooters see a group and one flier, the flyer being the first shot fired.
The solution is to wind the silencer all the way on and pull back one to drop it into the valley and you should see your groups get better without a flier.
Thoughts?
Interesting. I’d have guessed that backing of a tooth would allow slight play and thus inconsistent harmonics. 
From a pracitcal standpoint, there’s no way I’d go to this trouble in the field.
So really, what am I supposed to do? Just frustrated at the whole situation with everyone saying the 51T mounts allow “slight wobble”, AAC says this is normal and ok, and others say the cans/mounts are impossible to get the can tight on, etc. My SPR/M4 is still a few months out, and the more I read about it, the more frustrated I get over the little pedantic detail of attaching the thing correctly 
I want to be able to get the thing and GO!
So you don’t have your can yet? Pappabear has a bunch of the 51t mounts and several M4-2000s. We just crank them on and go.
I’ve never felt any movement in his cans. I wouldn’t worry about something you don’t even have yet.
That is pretty good. Most times it is 3-5 inches.
C4
Sounds encouraging after all the horror stories I have read. Thanks!
The horror stories are 1 for every 1000 people without a problem, I’d guess.
AAC openly advises people to run them loose, though, so I figure its more than just that?
http://www.silencertalk.com/forum3/viewtopic.php?f=86&t=52813&hilit=wobble