What Suppressor For A HK-91...?

[SteyrAUG]

I've suppressed a few .308s, but mostly bolt guns with dedicated thread mounted cans.

I have enough 91s that I've decided to equip one with a suppressor but I'm not really current on best setup for that rifle.

It won't need to be full auto rated as I will be using a factory semi auto rifle. The main thing I'm looking for is something that will maintain / improve accuracy rather than degrade it, it's already a 2-3 MOA rifle as is. After accuracy I'm looking for best suppression with standard .308 rounds (it won't be subsonic).

I'm ok with swapping out the factory flash hider for a QD mount flash or direct mounting to the threads (15x1 RH). I was looking at the Gemtech One and it's a flexible can but not sure I'm gonna walk it around much and wondering if there is a better suppressor for the money.

I have a 91 with a William set trigger and an old Zeiss scope and that is gonna be my suppressor host.

[Defaultmp3]

Maybe the TBAC Ultra series? It's a popular choice for bolt guns where accuracy is paramount, is fairly lightweight, suppresses well, and can be found in the correct thread pitch. The Dominus, if you want to err on the side of durability over weight.

[Pappabear]

A lot of good options out there and let me add this. You may want to consider getting an overboard can to reduce the chance of endocap strike. Dont know if this an issue for 2-3 Moa guns, but just a thought.

PB

[freeride1]

I have a Dead Air Sandman S on my 91 and really like it. I've got a little different set up and objectives though, you might consider the Sandman L with what you are saying.
My gun was converted by TSC to a G3K so 12.3" barrel, which meant I placed a premium on durability and a solid mounting system. I'm very happy with the mounting system, it's lock up is solid and hasn’t gotten stuck on the barrel. Accuracy is the same suppressed or unsuppressed (new shooters seem to find it easier to group with the can but thats not mechanical imo) and it has minimal POI shift.
I went with the S because sound was less important to me than weight (Rollerlocks are already heavy and this one especially) but since you are placing a premium on sound reduction the Sandman L might work better for your needs.
One other thing to note, I really like dead air because of the availability of oddball threads and even different designs for muzzle devices. I enjoy foreign/oddball non-ar15 designs (as I know you do) and it seems like the owners of dead air do as well which leads to more variety in that respect.

[SteyrAUG]

I would have never even thought to look at Dead Air, sounds like a winner. I have a Wolverine for my AK series guns and it's been impressive.

[freeride1]

Take a look at a #17 locking piece as well. I've found it is excellent for use with a suppressor.

[SteyrAUG]

Take a look at a #17 locking piece as well. I've found it is excellent for use with a suppressor.

So I have factory G3s and factory 91s, what does swapping out the locking piece in my 91 for a #17 (which from my research is made for the 21) do for me with respect to suppression?

Also doing some additional research I found that maybe the HK .308 series might not be the best candidate for suppression.

https://www.hkpro.com/threads/lockin...estion.111682/

The money might be better and more safely spent on a suppressed SR-25 package. Not sure I want to buy a $1000 can that is gonna run my rifle really hard to the point it might self destruct. It is kind of telling that you never really saw a suppressed PSG1 or MSG90 come out of HK.

[freeride1]

You should be ok with the factory 45 degree locking piece. But the #17/36 degree locking piece slows down function and counteracts the extra pressure introduced by the suppressor. The #17 was originally for the 21E, to slow down the rate of fire. A #9/40 degree locking piece is another option, it was designed for the HK11.

If you are running your gun semi, you can probably just leave the #17 locking piece in the gun full time. For full auto unsuppressed use I would swap the locking piece back to the stock G3 piece, just to ensure reliable extraction.

Those guys in that post are idiots, the #18/50 Degree is at the opposite end of the spectrum. Using that is causing their gun to run harder. Even so, there was likely something wrong with that gun to cause the stock to blow out. I would recommend using at least heavy buffer (your HK91 likely has one already if it is an A2.)

The MSG90A1 was designed to run suppressed (even mentioned on the HKUSA MSG90A1 page,) but you didn't see many of them by the time they were introduced as the whole system was pretty much obsolete. I think the lack of suppressors was a function of era more than anything, rifle suppressors were much less common in the 70s/80s (and unheard of in the 60's when the G3 was introduced.) Particularly with the buffers in the PSG1/MSG90 stocks you won't have any issue. Same goes for the heavy buffer and the HK21E buffer.

I and several shooting buddys have run HK's very hard with suppressors, I think they are great suppressed. I've not had any issues with destruction, but I'm careful to use the proper buffers.

Below is me running the previously pictured gun. I run the #9/40 degree HK11 locking piece. Same benefits as the #17 but it's a little steeper angle and I think the ejection with this particular gun is better for full auto use:

https://imgur.com/0ocunTk

[SteyrAUG]

So my intended host would be a 91A2 that I bought back in 1983, not sure I want to risk that or even trade out parts. I notice you are running a MSG90 stock on your rifle, I may have to rethink and just go with a PTR as a host gun.

I've got too much money tied up in my G3s, including one pre 68 transferable factory gun, to want to run them suppressed.

[freeride1]

It sounds more complicated than it is, especially if you are running the HK91A2 Semi.

Funny you mention the KAC SR25 though, I just acquired a NIB SR25 CC through some horse trading and am going back and forth about whether to keep it... Definitely a cool platform, but between the KAC can and optics I'm looking at another $4k to set it up.