Pressure thoughts

[coastguardchas]

A new upper was received a few years ago, builder not identified, and when first fired shot fine for about 20rds, until the gas block fell off, due to a loose allen screw holding it to the barrel. I was without tools at the time, and continued to fire my remaining rounds, manually recharging. I did not notice any difference in the point of impact during this session, but after finished firing, thought maybe the lack of pressure drain could be negative factor in the recycling and pressure factor in my Grendel. No hi pressure signs were noted.
Being from Kalifornia, semiautos are not well appreciated, so maybe removal of the gas block with a plug in the vent hole would be an alternative action to the anti-gunners rant. The resulting rifle would be the same as a bolt gun, requiring manual recharging.
My main question to the smart guys on this forum is: how will this effect chamber pressure, and will there be any negative effect on the rifle overall.. Chas

[RangerRick]

No ill effects. In England gas guns are not allowed so AR's have to operate in that way by law.

The max pressure is well before the gas port so a closed port won't affect that anyway. I'm surprised you didn't lose more velocity with an open gas port, though.

RR

[StoneTower]

Just don't put your finger over that little hole when you fire it.

If you live in California...slap a bullet button on your lower and have fun. The Grendel is a great little cartridge because it functions in an AR-15 which is designed to be a semi-automatic. If you want a bolt action there are many other choices which are equal or better. If you are in love with the Grendel cartridge in an Ar-15 you might want to have a bolt gun too, but you could just as easily have a 25 WSSM or a .260 and have better performance.

[coastguardchas]

Stoner: I have installed the Bullet Button in all of my AR's, which makes them good to go, according to dealers in my area.. CM

[stokesrj]

California has a really strong high power rifle program and the junior team, the California Grizzlies, they are the only civilian team to beat the Army Marksmanship Unit in the National Infantry Team Trophy Match. If you are not familiar with this match it is also called the rattle battle match and is a ton of fun. Starting at 600 yards and advancing towards the targets to 500, 400 and then 300 yards with 50 seconds at each yard line, using 30 round magazines and shooting as fast as possible while keeping hits on a man shaped and sized silhouette E & F targets. Mag change time is a at a premium. The only bobble I've seen from the California team is when they are trying to find a cartridge with a bullet to dump their empty magazine, forgetting they are in Ohio where a finger works for that purpose.
California has some really stupid laws, but they manage to produce some fine riflemen and women in spite of those laws.
Here is a link to more information on the Rattle Battle match
http://www.odcmp.org/0307/default.asp?pa...U_INFANTRY
I'll be practicing for it next weekend with my Florida state team.
Here is a link to the California Grizzlies.
http://www.teamgrizzlies.org/
To your original question, there is no need to disable the gas system, that is way to left leaning for the US, just put in a California mag release. That is a totally ridiculous requirement but at least you can still enjoy the rifle for what it is a gas operated semi-auto.
Here is a link to one of the bullet button mag release.
http://www.nationalgunsupply.com/Raddloc...ddlock.htm
Bob