AAC 7.62 SD or SDN-6 (newer)

General Firearms NFA
1

I was reading the paperwork on the two above mentioned cans. It looks like you drop an inch and lose a couple dB’s (2-4). Is there any other reason to get the SDN-6? SDN-6 weighs about the same or an OZ more. Difference in $$ not the issue.

Weight, mfg material, is about equal
Lose weight-gain sound

From Literature: SD 19.1 oz, length added 7.25 inches
SDN-6 19.85oz add 6.1 inches

material the same inconel-316l SS

Reduction
SD 27-29 dB reduction
SDN-6 25db reduction

I am leaning to the more quiet slightly longer AAC. I will be putting it on a LMT 308 with 16inch CL barrel. So its hardly my featherweight run and gunner.

Gentlemen, your thoughts?

pb

2

The SDN-6 is all inconel and came about largely from the .300 Blackout program. I think it would be tougher on a short barreled 7.62MM due to it’s construction (similar to M4-2000).

That said I’m going with a 762-SD due to cost and availability (right now versus ??). This will initially sit on the AAC Remington 700 but will migrate to a LMT 308 and/or a .300 Blackout upper…

3

762-SD vs. 762-SDN-6

'SD:
51-tooth ratchet mount
Inconel blast baffle
Stainless tube, stainless baffles, stainless endcap
a couple dB’s quieter on longer barrels - ≥18-20"
$200 cheaper, widely available
About .7 oz lighter

'N-6:
51-tooth ratchet mount
All-Inconel baffles, including endcap
Stainless tube
a couple dB’s quieter on shorter barrels - ≤16"
1 inch shorter

So, the N-6 is the best choice for shorter barrelled and/or full-auto use.

On 300 BLK semi-auto, the main diff. is the shorter length and 2 or so dB.

Pappabear- the sound measurements in the catalog are not directly comparable as they are on different hosts.

4

When will the N-6’s be available for civilian sales?

5

They are available for sales through all our dealers now. The latest ship date I’ve heard is 3rd week of April.

6

My fingers are crossed. My paperwork is just waiting for a serial#.

If all goes well the SDN will be on my 300BLK SBR and 6.8 SBR by the end of July!:smiley:

7

I received stamps on two M4-2000 inside of 2 months. I’m out past three months now my SBR’s. Make me crazy.

8

Sounds like “constructive intent”. Sending email to BATFE now.

9

Ordered an n6. No matter how fast they ship, it’s going to be a long wait. Really excited. I can’t wait.

10

yes, I am going N6 too.

11

I am currently on a waitlist for an N6 at my local gun shop. 3 weeks ago I was quoted a 2 month lead time which I hope includes the F3 transfer from ATF.

Cheers

12

Good luck. Don’t bet on it.

13

Some form 3’s have recently stretched to 5-6 weeks. they usually were running in the 3 week area…

14

Where’s the data on the N6 being more quiet on short barrels? The test I saw had the SD testing a few db quieter on an 8"barrel test barrel? I’m asking because I’m debating which to get between those two.

15

When you find some, let me know.

16

Think I will stick with the SD. Now to settle on barrel length…10.3" Delta Arms, 11.3" Wilson Combat, or 12.5" AAC???

17

What hand guard do you want to go with? Since .30 cal cans add significant length I went with an 8" Noveske to try to get the shortest possible package. Downside is that you lose some velocity and only get 7" of hand guard.

DD LITE or RIS II 9.5" for 10.3" barrel
Wilson Combat 10.4" T.R.I.M. for 11.3" barrel
11" for 12.5" barrel

18

Have a DD 10.0 Lite & 11" TRX on hand as I originally planned to go with 12.5". Now that I am considering going shorter I will look at the Wilson Trim as well.

19

I got an SD as well. All the testing done by M3 indicates its quieter on…well everything over the N6.

I would, and did go as short as possible. Are you talking 5.56, .300, or .308?

With anything but the .308 I would go as short as possible, an LMT 10.5 (5.56) or an AAC 9" (300 BLK)