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Thread: Low profile gas block
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15-04-2022, 13:21 #1
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Low profile gas block
Hi everyone.
I'm looking for a 0.75 steel low profile gas block for my AR.
Has anyone seen or heard of stock anywhere?
Hailstorm has the Ergo low profile adjustable gas block which they say works very well, but I'm not sure if an adjustable gas block is the best choice and I'd rather stick to the standard version.
Thanks.
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15-04-2022, 14:17 #2
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Re: Low profile gas block
Im not too familiar with these but apparently adjustable is the way to go
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15-04-2022, 14:59 #3
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15-04-2022, 15:33 #4
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Re: Low profile gas block
Well.i only just recently purchased an AR.. Patiently going throught the motions.
Anyway prior to buying 1. In terms of the gas system if you aren't buying a full lenght gas system.. The mid lengths are "usually" overgased and the adjustable makes life easier in fine tuning the system.
Look this purely theory for me for now. Until i can start shooting my to find out first hand.
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15-04-2022, 15:50 #5
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Re: Low profile gas block
A lot of systems that are available is carbine length. Mid length is something you have to look out for and rifle (full) length is most probably a special order.
Run of the mil systems are over gassed because it increases reliability when using a wide range of ammo.
I had a 16" barrel cut down to 14.2" and it seems like it is perfectly gassed now throwing brass at 3 o'clock with a fixed gass block. This is also a carbine lentgh system and I have had no issues.
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15-04-2022, 16:50 #6
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15-04-2022, 17:04 #7
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15-04-2022, 19:21 #8
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15-04-2022, 19:34 #9
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Re: Low profile gas block
Sky operations in Durban sells the aero precision low profile .750 gas blocks
https://skyops.co.za/?product=aero-7...file-gas-block or try http://shop.bellumarcus.co.za/
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15-04-2022, 19:54 #10
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Re: Low profile gas block
Feel like I've said this before on this forum, but anyways.
An adjustable gas block on most AR15's is a good investment, as 99% are over gassed with the exception of a few higher end guns aimed at competition.
The issue is that the word adjustable should be chuckled and rather tunable used. In that you set it up and adjust it to run with a regular carbine buffer (I will get to why) with whatever competition ammo you load, or to run the weakest factory ammo that is available reliably.
You will have a softer shooting gun, that is not over gassed, meaning your BCG velocity will be reduced, which means longer service life.
A heavier buffer is just a band aid masking the problem, and although your recoil impulse will feel softer as it will be over a longer period, vs a lighter buffer all that mass still needs to be sent forward.
If you shoot well enough, or pay enough attention to your reticle you will notice more muzzle dip on bolt closure, not to mention with the higher closing velocity you add more stress on the locking lugs and cam pin as they close.
People speak about gas system lengths, but the reality is that when the AR15 was first designed there was a specific length from the muzzle to the gas port. Now my memory is a little fuzzy on which length barrel the carbine gas system was designed around but it had the same distance from muzzle to gas port as the original 20", the same for the midlegth gas system as the 16" barrel.
All this is done to mimic the dwell time of the original 20" gun, but there is a trade off as the gas port is still closer to the breach. Recoil on shorter gas systems is generally perceived to be higher for same load compared with longer gas system as the pressure drop off from the gas port to the gas key is lower than the longer gas system.
This also leads to further increased Bolt Velocities, and in some cases early unlocking of the bolt. It's very well known about the early Vietnam era Colt Commandos that destroyed themselves due to this.
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