Talk to me about blowback - XDTalk Forums - Your HS2000/SA-XD Information Source!

propellerhead · 05-05-2008, 08:11 AM

What causes it? Why is it more common in SBRs and suppressed rifles?

spamlovr · 05-05-2008, 10:33 AM

the term "blowback" is normally used for how an autoloading rifle system operates.
Howstuffworks "The Blowback System"

If you are talking about something else, I don't know what it is. Can you elaborate?

propellerhead · 05-05-2008, 10:39 AM

I'm thinking I get blowback gas in my face when I shoot my AR. I want to understand it better. The PRI Gas Buster Charging Handle is an $89 solution. I was hoping for a less expensive solution.

Stinging feeling from the stock

ckuplent · 05-05-2008, 10:46 AM

Where the CH meets the upper there is a slight gap- this allows some of the gas to blow back into your face. Hence the gas buster or the DIY with silicone to correct it. I never noticed it much until shooting suppressed with my 10.5"- and even then it's not too bad.

propellerhead · 05-05-2008, 10:56 AM

Is it escaping from where the gas tube meets the bolt carrier?

zac07 · 05-05-2008, 11:33 AM

yes, I have never noticed it on my face but when i wear a white shirt and shoot it gets all over it.

Bidah · 05-05-2008, 12:11 PM

The ports on the short barreled rifles are located in a pistol position, which is at a much higher pressure than when located in the carbine or rifle position. So, once the carrier comes off of the gas tube during the cycle, that gas gets fed down the channel and around the gap in the charging handle/upper. Suppress rifles dump even more gas back that way. Depending on where you put your head on the stock, you get more than others.

Deadcenter · 05-05-2008, 08:57 PM

Its called "blow by" - hot gases blow by the rings on the piston (bolt) in the cylinder (bolt carrier) then escape thru the gap in the charging handle

Hutch4KSU · 05-05-2008, 09:14 PM

Beano will handle blow back.

spamlovr · 05-05-2008, 10:36 PM

You could try this:
gasbuster

05-05-2008, 08:11 AM	#1
propellerhead XDTalk 3K Member Join Date: Apr 2006 Location: Foat Wurth, TX Posts: 3,218	Talk to me about blowback What causes it? Why is it more common in SBRs and suppressed rifles? __________________ XD Trifecta: XD-9 Tactical for practice & IDPA, XD-40 Subcompact for concealed carry, XD-45 Service for home defense. Three purposes, three calibers, three models. One gun.

05-05-2008, 10:33 AM	#2
spamlovr XDTalk 100 Member Join Date: Oct 2006 Location: Washougal, WA كافر Posts: 465	the term "blowback" is normally used for how an autoloading rifle system operates. Howstuffworks "The Blowback System" If you are talking about something else, I don't know what it is. Can you elaborate? __________________ Memento Mori (Remember, you are mortal) When seconds count, the police are only minutes away! People who are pissed at the government have generally underestimated their neighbors. Ziltoid The Omniscient for Supreme World Ruler 2008: "I am so omniscient, if there were 2 omniscient beings in the omniverse, I would be both of them! Bring me your planet's finest cup of coffee!"

05-05-2008, 10:39 AM	#3
propellerhead XDTalk 3K Member Join Date: Apr 2006 Location: Foat Wurth, TX Posts: 3,218	I'm thinking I get blowback gas in my face when I shoot my AR. I want to understand it better. The PRI Gas Buster Charging Handle is an $89 solution. I was hoping for a less expensive solution. Stinging feeling from the stock __________________ XD Trifecta: XD-9 Tactical for practice & IDPA, XD-40 Subcompact for concealed carry, XD-45 Service for home defense. Three purposes, three calibers, three models. One gun.

05-05-2008, 10:56 AM	#5
propellerhead XDTalk 3K Member Join Date: Apr 2006 Location: Foat Wurth, TX Posts: 3,218	Is it escaping from where the gas tube meets the bolt carrier? __________________ XD Trifecta: XD-9 Tactical for practice & IDPA, XD-40 Subcompact for concealed carry, XD-45 Service for home defense. Three purposes, three calibers, three models. One gun.

05-05-2008, 11:33 AM	#6
zac07 XDTalk 1K Member Join Date: Feb 2007 Location: West Texas Posts: 1,014	yes, I have never noticed it on my face but when i wear a white shirt and shoot it gets all over it. __________________ The Guns: XD40 Service Mossberg 500 12 ga Remington 597 .22 Remington 700 .243 Remington 870 12 ga

05-05-2008, 10:46 AM	#4
ckuplent XDTalk 100 Member Join Date: Feb 2008 Location: Hippytown, Oregon Posts: 137	Where the CH meets the upper there is a slight gap- this allows some of the gas to blow back into your face. Hence the gas buster or the DIY with silicone to correct it. I never noticed it much until shooting suppressed with my 10.5"- and even then it's not too bad.

05-05-2008, 12:11 PM	#7
Bidah XDTalk 500 Member Join Date: Oct 2006 Location: Isolated, Montana Posts: 663	The ports on the short barreled rifles are located in a pistol position, which is at a much higher pressure than when located in the carbine or rifle position. So, once the carrier comes off of the gas tube during the cycle, that gas gets fed down the channel and around the gap in the charging handle/upper. Suppress rifles dump even more gas back that way. Depending on where you put your head on the stock, you get more than others. __________________ -Bidah “The very powerful and the very stupid have one thing in common. Instead of altering their views to fit the facts, they alter the facts to fit their views...which can be very uncomfortable if you happen to be one of the facts that needs altering.” The Doctor

05-05-2008, 08:57 PM	#8
Deadcenter XDTalk 500 Member Join Date: Mar 2007 Location: Southern Oregon Coast, USA Posts: 692	Its called "blow by" - hot gases blow by the rings on the piston (bolt) in the cylinder (bolt carrier) then escape thru the gap in the charging handle

05-05-2008, 09:14 PM	#9
Hutch4KSU XDTalk 100 Member Join Date: May 2006 Location: Hutchinson, Kansas Posts: 494	Beano will handle blow back. __________________ NOBAMA!! Black XD 45ACP Service Bi-tone XD9 SC Ruger Standard .22 LR Ruger Super Redhawk Alaskan .454 Casull/.45 Long Colt 2 1/2 barrel (say hello to my lil' friend!) AR15 Finished!

05-05-2008, 10:36 PM	#10
spamlovr XDTalk 100 Member Join Date: Oct 2006 Location: Washougal, WA كافر Posts: 465	You could try this: gasbuster __________________ Memento Mori (Remember, you are mortal) When seconds count, the police are only minutes away! People who are pissed at the government have generally underestimated their neighbors. Ziltoid The Omniscient for Supreme World Ruler 2008: "I am so omniscient, if there were 2 omniscient beings in the omniverse, I would be both of them! Bring me your planet's finest cup of coffee!"

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