Ready for dedicated 5.56, befuddled by choices

General Firearms NFA
1

A bit of background info:
I have a 762SDN6 (shoot limited .300 blackout on 9"AAC, and will shoot HK MR762 once I get a 51T installed)

I had just SBR’d a Scar 16 and then I got a SBR HK416 10.4" (well it started as a MR556)
I am ready for a dedicated 5.56 can, was just going to pick up a m4-2000 from a SOT friend, but figured I should shop a bit first
I started looking at the OSS system. (I like the idea that it indexes back over the barrel for use on longer barrels) but it negates the SBR’s advantage of shorter length
From what I understand, HK purchased 300 units of the OSS and sells them with their rifles (that’s a strong endorsement to me)

The OSS video’s, marketing info and the limited user feedback I found had me hooked. I spoke with the guys at silencer shop as they had the OSS system, but see on the OSS website they got slapped on the wrist for selling below MAP)
Knowing that they no longer sell the OSS, I take what they said with a grain of salt; but he mentioned the system being dropped by HK and that they question if OSS will be around for much longer…
OSS report’s only a 6% increase in bolt velocity and no/negligible blowback.

One of the difficulties with the HK416 presently is lack of adjustable gas block (there are some folks working on making one now)
So if the suppressor is on, I am over gassed and get blow back and increased bolt speed such that I am not getting bolt hold open. (I have not tried other buffer and springs yet, other than the heavier factory HK buffer)

It seems things are ebbing away from AAC since the last time I was in the market. I have not had a problem with the 51T, so not sure what the criticism is with it?
But it does not seem like the M4-2000 is not state of the art at the moment…
I have tried to read thru the recent threads on the Omega etc. but end up more confused comparing all the mounts that I have not had a chance to compare.

  1. Anyone familiar with the OSS? just don’t see much on this forum about it.
  2. KAC, Templar/Crux, Omega,M4-2000, Surefire Socom RC 2.0, Saker.; can someone help me limit down the choices by providing some overviews/insights.
    Cost difference is a low priority; I feel like you marry NFA items; not gonna sweat a small cost savings over quality

My goals are a suppressor for 10.4" SBR 5.56, weight and length are concerns;
I don’t want to go so small that I compromise volume and dB. (if I can go hearing safe with full size can, It is worth it) But if I am having to go ear pro all the time no matter what (I use the surefire ear plugs); then I might as well get a small suppressor.
Adaptability to 51t? not sure if its a good thing or a bad thing; I can always just use my 762SDN on HK, SCAR H, and .300 blackout

Do any of the newer suppressor designs help with backpressure? I saw the Templar videos and they mentioned a gas vortex design, but they were showing the .30 cans.

2

Go with a mini can, even full length I shoot with muffs or plugs. My next rifle can will be a KAC 556QDC CQB, run exclusively on my SCAR 16 SBR.

3

The only two choices here are a surefire RC or a KAC ball mount.

4

^ Not so. If hearing safe is a concern, the Silencerco Saker, and Omega are both good candidates. Surefire cans WILL NOT be hearing safe on a 10.5" in my experience.

ETA: Before the POI armies come and raid my camp I was able to complete some testing on POI shift with the Saker this past Sunday. I fired 10 rd groups using two ammunition types and the results were almost identical.

1st load:

Rem brass
Hornady 55 gr FMJ
24.5 gr TAC
S&B SR primer
loaded to cannelure

This load produced 1.75" 10 rd groups at 100 yds unsuppressed, and the same sized groups but 3 inches low suppressed. It was to be expected as I was using a 14.5" lightweight FNH CHF barrel for this test.

2nd load:

LC 07 brass
77 gr SMK
23.6 gr TAC (most accurate)
Rem 7 1/2 BR primer
Loaded to 2.25"

Most accurate load of the day. Produced 1" groups from the first test (each ammo was tested twice, both with 10 rds suppressed and unsuppressed) and 1.5" groups from the second. I believe I didn’t let the barrel cool enough from the previous tests and it caused the second group to open up slightly. Suppressed groups were again 3" low but centered at the bottom of the target. POI shift was about as I expected considering the lighter profile of the barrel. Outside of the shift I experienced the Saker is hearing safe on 10.5" guns and does have reduced back pressure when compared to similarly priced suppressors from AAC, Gemtech, and the less expensive Specwar 556. It is not the lightest weight on the market but I knew that when it was purchased. My rifle is sub 6 lbs unloaded with optic and light and was willing to forgo maneuverability for durability. Flash is nearly nothing on a 14.5" barrel, and acceptable on shorter lengths.

From my experiences I will not hesitate to add another if funds allow, but for now my next suppressor will be the Silencerco Omega.