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Posted: 1/27/2017 6:59:27 PM EDT
[#1]
I wear a bandana over my face when I shoot my M11/9 suppressed. It's positively nasty on full auto and I end up looking like a raccoon.
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Posted: 1/27/2017 7:05:39 PM EDT
[#2]
adjustable gas block or a gemtech bolt carrier?
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Posted: 1/27/2017 7:09:05 PM EDT
[#3]
Heavier buffer to delay unlock (allows more time for the gas to escape the bore & suppressor before the chamber is opened).
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Posted: 1/27/2017 7:17:05 PM EDT
[#4]
Adjustable Gas block
Lantac Enhanced bolt Griffin Snach Griffin AR-SOB RTV is so 20 years ago. |
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Posted: 1/27/2017 7:21:29 PM EDT
[#5]
Gemtec bolt carrier. Can't recommend it enough.
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Posted: 1/27/2017 8:49:00 PM EDT
[#6]
I am running a H2 buffer in this lower.
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Posted: 1/27/2017 10:37:20 PM EDT
[#7]
Quote HistoryQuoted:
Gemtec bolt carrier. Can't recommend it enough. Adjustable carriers cut off gas at the carrier, so all the excess gas is still vented into the upper. For a gas blowback issue, I would imagine an adjustable block would be more desireable. |
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Posted: 1/28/2017 8:23:01 AM EDT
[#8]
Face gas is really a matter of suppressor design and ammunition. The majority of it is a result of the gases trapped by the suppressor equalizing back through the barrel, fore and aft, during extraction. The type and quality of the propellant used in the ammunition your shooting also plays a role. Gas system parts will have little, if any, affect on the amount face gas. The volume of gas scavenged from the barrel to operate the rile or carbine is extremely small.
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Posted: 1/28/2017 9:15:39 AM EDT
[#9]
Quote HistoryQuoted:
Adjustable carriers cut off gas at the carrier, so all the excess gas is still vented into the upper. For a gas blowback issue, I would imagine an adjustable block would be more desireable. No. This particular design vents it out the ejection port, just like it usually happens. Check out the reviews on youtube. |
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Posted: 1/28/2017 10:27:18 AM EDT
[#10]
Quote HistoryQuoted:
No. This particular design vents it out the ejection port, just like it usually happens. Check out the reviews on youtube. While that isn't pressurizing the receiver area, I don't see how this is better than an adjustable gas block that would keep excess gas out of my face completely? Port exhaust hangs around a bit. |
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Posted: 1/28/2017 10:37:31 AM EDT
[#11]
Quote HistoryQuoted:
While that isn't pressurizing the receiver area, I don't see how this is better than an adjustable gas block that would keep excess gas out of my face completely? Port exhaust hangs around a bit. If face gas is a result of the operating system and can be eliminated with an adjustable gas block, then how does my MP5SD generate so much face gas when it doesn't have a gas system? |
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Posted: 1/28/2017 10:43:25 AM EDT
[#12]
Quote HistoryQuoted:
If face gas is a result of the operating system and can be eliminated with an adjustable gas block, then how does my MP5SD generate so much face gas when it doesn't have a gas system? Quote HistoryQuoted:
Quoted:
While that isn't pressurizing the receiver area, I don't see how this is better than an adjustable gas block that would keep excess gas out of my face completely? Port exhaust hangs around a bit. If face gas is a result of the operating system and can be eliminated with an adjustable gas block, then how does my MP5SD generate so much face gas when it doesn't have a gas system? Bore pressure isn't what I'm talking about. That's more of a timing and backpressure issue. The assertion was made that the adjustable gas carrier was a better solution than an adjustable gas block. I'm trying to determine in what way it is better. |
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Posted: 1/28/2017 11:01:11 AM EDT
[#13]
I run SLR's on my suppressed guns now, and it helped reduce the gas significantly. However, I still get some gas to the face from the action... at this point, it probably about the best it can be.
Several months ago, I had some time behind a MP5SSD running in full-auto, and afterwards, I had oil and crap everywhere. For some reason, I didn't mind the gas as much. 
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Posted: 1/28/2017 11:13:33 PM EDT
[#14]
All depends on the barrel/can design.
Hence if you running K baffles designs, then the pressure builds up going forward against the baffles, and is vented back towards the chamber as the pressure releases. Funny that at MP5SD was brought up, since on a un-ported barrel, the design works very well for a void for the back blast pressure to go instead of directly to the chamber instead. The glitch on the SD, is the the barrel is ported to hell at the reflex section of the can to dump +P ammo pressure to keep the round subsonic, so this part of the can sees a ton of pressure before the baffles do on the SD. So here is the reflex can, 
And her is the SD barrel ports, that dumps all the pressure into the reflex can section, to make the MP5SD run so dirty instead. 
Hence un-ported barrel, it gives a lot of room before the blast section for the back pressure gas to dump out there into the reflex section of the car, isntead of all the back pressure gases coming directly back at the chamber instead. To add, on a 300 BLK running sub sonic, your really don't need a lot off can to keep it quiet, and the SD baffle stack like below would more than enough isntead. Hence instead of the pressure wave hitting smaller K baffles, the pressure is more distributed/dipensed within the entire can after the reflex/blast section isntead. 
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Posted: 1/30/2017 2:41:57 AM EDT
[#15]
I dont have any suppressor experience nor do I have adjustable gas block experience so my question is, would a gas block like the Superlative Arms bleed off help to keep some of the gas from coming back without negatively effecting performance? In my mind it would but again, no experience.
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Posted: 1/30/2017 3:15:59 PM EDT
[#16]
Quote HistoryQuoted:
how does my MP5SD generate so much face gas when it doesn't have a gas system? MP5's (and other HK roller firearms) actually do have a gas system of sorts. The fluted chamber uses residual gas pressure from the bore to force the case to extract, in the process of which blows a considerable amount of gas/fouling rearward onto the bolt, receiver area, and out the ejection port toward the user. |
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Posted: 1/30/2017 3:18:19 PM EDT
[#17]
My PRI Gas Buster makes a big difference to me.
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Posted: 1/30/2017 9:53:09 PM EDT
[#18]
Quote HistoryQuoted:
MP5's (and other HK roller firearms) actually do have a gas system of sorts. The fluted chamber uses residual gas pressure from the bore to force the case to extract, in the process of which blows a considerable amount of gas/fouling rearward onto the bolt, receiver area, and out the ejection port toward the user. You may very well be right. I know what I don't know but... Wouldn't the case have to fully obturate until after the bullet exited the bore? At what point in the firing cycle does gas come into play and how much? |
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Posted: 1/30/2017 10:14:06 PM EDT
[#19]
Quote HistoryQuoted:
You may very well be right. I know what I don't know but... Wouldn't the case have to fully obturate until after the bullet exited the bore? At what point in the firing cycle does gas come into play and how much? Quote HistoryQuoted:
Quoted:
MP5's (and other HK roller firearms) actually do have a gas system of sorts. The fluted chamber uses residual gas pressure from the bore to force the case to extract, in the process of which blows a considerable amount of gas/fouling rearward onto the bolt, receiver area, and out the ejection port toward the user. You may very well be right. I know what I don't know but... Wouldn't the case have to fully obturate until after the bullet exited the bore? At what point in the firing cycle does gas come into play and how much? |
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Posted: 1/30/2017 10:30:31 PM EDT
[#20]
Quote HistoryQuoted:
I have no idea what I'm talking about but isn't that the magic of the roller-lock/delayed blowback system? In my mind, there is no magic in an HK. My MP5SD is a dirty bird. The thought of cleaning it after a range session is why it never see's the light of day. |
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Posted: 1/30/2017 10:49:10 PM EDT
[#21]
Quote HistoryQuoted:
In my mind, there is no magic in an HK. My MP5SD is a dirty bird. The thought of cleaning it after a range session is why it never see's the light of day. Quote HistoryQuoted:
Quoted:
I have no idea what I'm talking about but isn't that the magic of the roller-lock/delayed blowback system? In my mind, there is no magic in an HK. My MP5SD is a dirty bird. The thought of cleaning it after a range session is why it never see's the light of day. I hear you. I had a 91 and it wasn't exactly clean. And of course it mangles brass. But doesn't that delayed blowback address that issue you raised regarding gas and the case? There is a period where the bolt is locked up while the rollers are being pushed in and eventually they get to the point where the bolt can move back, the bullet is gone or just about gone, and the residual pressure does it's thing with the case. If I understand correctly anyway. |
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Posted: 1/31/2017 2:12:18 PM EDT
[#22]
I use a PRI Gas Buster, Tubb's Carrier Weight System, an H Buffer and light weight bullets with fast burning powders. It rocks for me.
I use 20.5 grains of H4198 with 52/53 grain match bullets and get 100% reliability, no gas in my face and 3:00 to 4:00 o'clock brass ejection. The powder charge is maximum according to my chronograph but produces the lowest port pressure of any powder useable in .223. This load may or may not cycle a 20" "rifle gassed" unsuppressed rifle. It has always worked for me in carbines suppressed or not. I'm running a 5.56mm SAKER and a 16" barrel. M193 and M852 use slow for caliber powders which creates a lot of port pressure. Way more than needed to run a rifle. It's not unusual for M193 to have powder charges weighing 27.0+ grains. It allows higher velocities with safe maximum pressures but has the side effect of over gassing the system when a suppressor is used. |
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Posted: 2/3/2017 2:45:47 PM EDT
[#23]
The simplest upgrade you can do is buy a PRI Gasbuster CH Handle. It will make an immediate difference. Other than that you may be pretty much screwed
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Posted: 2/3/2017 3:10:48 PM EDT
[#24]
I don't have my Sandman yet, but my 11.5 already has a gas vent forward assist, and I plan to do the RTV mod to a BCM charging handle.
I'm considering a Gemtech BCG also, but I haven't decided. |
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Posted: 2/3/2017 4:26:28 PM EDT
[#25]
I appreciate all the input in this thread.
I did adjust my AGB to the point where it ejects unsuppressed at about 5 o'clock; with the can on ejection is 2:30-3 but the gas in the eye has been mostly eliminated. Hopefully adjusting the gas down so far during the winter cold will allow it to remain fully reliable in warmer temperatures. |
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