If I go this route, in your opinion would it be better to cut the barrel on the 6920 or just buy a whole new upper(10.5")? If so do you or anyone else have an SBR upper that you recommend for reliability, etc(specifically to run suppressed)? As I mentioned in another thread I'm a bit traumatized from an experience with S&W so I'm scared of anything that isn't Colt.
That is really up to you. I know I would prefer to have both, different applications for each barrel length...the problem with cutting a barrel is that now your gas port is out of spec for the now shorter barrel...shooting suppressed "could" remedy this (due to the backpresure), but you might have to play around with it....Noveske, LMT, BCM, DD, Colt are all reliable...I've drank the Noveske cool-aid and I like it
Also, if I do either cut the barrel on the 6920 or purchase a new SBR upper would I have to purchase two stamps(one for the suppressor and one for the 10.5")?
Yes, unless you weld a suppressor to the end making the "barrel" 16+" (don't recommend that)
Well the reason I asked about that, according to
THIS they make it sound like you have to thread "it". If you read on the lower right hand corner they're talking about barrel threading, etc. Would I just be better off buying the upper from them and the suppressor? That way I have the whole "kit and kaboodle" in one shot?
Yeah I saw that...don't really know what they mean by that. The 762-SDN-6 suppressor that they make for their AAC Blackout definitely uses their QD flash hiders/brakes so I don't know why you would need a thread protector...unless it comes with two separate barrels???
Also, about the 300BLK round, its supposed to be a great round especially for suppressed shooting, but as far as I know, there is only 2-3 loadings for this caliber and the ammo is pretty hard to find an expensive...I personally would wait for the round to either catch on and be mass produced or just die out...
If you were shooting inside of your home with a can but with supersonic rounds would it be bearable? I've watched some videos already but there is no explanation on what kind of rounds specifically they're shooting. From what I've read on the SureFire chart is that it reduces it to 137 decibels(that's the highest one) from roughly 158 decibels. Now I don't know much about harmful sounds but that doesn't seem like much to me. And according to what I have read, OSHA tops out at 115db & indicates that it should be for less than 25 minutes. I'm not trying to say that OSHA is reliable most Gov't agencies are not but it's the only information I could find.
The "OSHA threshold" is 140 dB...most suppressors will put you below that, but inside of a house, I would imagine that it would still make your ears ring...but if you are in a life or death situation where you had to fire inside your house, auditory exclusion would kick in and you probably wouldn't even hear an unsuppressed rifle go off...which is why I am going for a mini suppressor for a 10.5" SBR so that I can minimize OAL while at least dampening blast (about 142 dB)
Understood, I've already done quite a bit of adding on but when it comes to the guts of the weapon I am a little leery. I'd almost prefer to purchase an upper for specific situations but I'm still new to most of this stuff and don't know if that's the right way to go.
Finally, thank you for taking the time to explain all of this in detail. My understanding is much better now, there isn't a whole lot of information available on this topic online...outside of these forums anyway. Not just that but my guess is googling most of this stuff get's someones attention, LOL.
Not a problem...I'm still learning myself. Just read alot and ask questions when you know enough what to ask for 
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