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7/7/2012 11:18:12 AM EDT
Ok, trying to get some info on what exactly an adjustable gas block does and what one would need it for. I have a mp15 optic ready carbine, and I would like to put a ff rail system on it. If the rail will not fit over it, I will replace the gas block. I am also waiting on my stamp for my aac 762 can. Thanks brilliant minds of the hive for some fast tracking on this.
7/7/2012 11:39:27 AM EDT
[#1]
Allows you to turn down the gas.  I had an overgassed 16" Middy with a port too large.  I'm using the Syrac Ordinance block, it has a detent to lock the adjustment screw in place.  Works great, much less gas and recoil...smoothed out the gun a lot.

If you're looking use a suppressor...they add a lot of backpressure and being able to turn down the gas would be nice.
7/7/2012 3:44:11 PM EDT
[#2]
Thank you, yes when shooting suppressed you do get that blow back of gas, so you can tune it down to cut some of it out. Sounds good I think I'm going to have to get one. The search begins...
7/7/2012 4:06:05 PM EDT
[#3]
Quoted:
Thank you, yes when shooting suppressed you do get that blow back of gas, so you can tune it down to cut some of it out. Sounds good I think I'm going to have to get one. The search begins...


Check out the Seeking Low Pro Adjustable Gas block.  

Rainier has them at a very competitive price.
7/8/2012 6:20:37 AM EDT
[#4]
Syrac Ordnance's block (aka AR Stoner, Spike's, etc) is a bit more expensive, but it uses a detent system to lock in the setting instead of set screws. That makes it quicker to adjust, and less likely to come "un-adjusted" during use.
7/22/2012 1:33:20 PM EDT
[#5]
I'm a little late to this thread. If you're still in the the market for a gas block check out the SLR rifleworks DA-7 adjustable gas block. It adjusts from the front with a single tool. No trying to push in on a button while turning the adjustment screw like some of the other designs. The adjustment screw uses a detent so you don't have to worry about the gas setting changing unless you want it to. I've put over 1k rounds through it and love it so far. Here's a link to the gas block.

DA-7 Gas Block
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