Anyone interested in a Hooded gas block FSB?

[SA Friday]

I've heard. What exactly do you mean 'blow', do they just blow apart or???

One reason I thought that may be a minor issue is Ruger and their new AR556 aluminum FSB. ???

The blow a hole out the side. They all ablate near the gas port and eventually fail from the ablation if they don't rupture from the pressure first.

Well, since I'm a full leg in... The clamp won't work either. Al with steel screws as it heats up will loosen. Even the steel clamp-on blocks are problematic.

[fmj50]

The blow a hole out the side. They all ablate near the gas port and eventually fail from the ablation if they don't rupture from the pressure first.

Well, since I'm a full leg in... The clamp won't work either. Al with steel screws as it heats up will loosen. Even the steel clamp-on blocks are problematic.

Clamp on is working fine on the SKS front sight i make all over US and Canada. It's the same basic design made from alum. extrusion and 2 8-32 socket head cap screws.

[fmj50]

But that's why I'm asking you guys....
Obviously the heat generated by an AR barrel and the gas heat combined may make it too much ?

[fmj50]

Anyone having problems with the Ruger AR556 FSB?
It's alum. but it's pinned.
Still it's alum. and will expand more than steel.....

[SA Friday]

Anyone having problems with the Ruger AR556 FSB?
It's alum. but it's pinned.
Still it's alum. and will expand more than steel.....

Yes... The only two aluminum gas blocks on DI ARs I have not seen fail yet are on rifle length systems and are the JP adjustable and the one WOA uses on their heavy barrels. They both will show ablation if taken off and inspected after a couple thousand rounds, but the same on a carbine system will fail.

Make one. Install it like you have. Test it to failure and document what you find after disassembly and inspection along the way to failure. Should be interesting.

[hurley842002]

Make one. Install it like you have. Test it to failure and document what you find after disassembly and inspection along the way to failure. Should be interesting.

This is the best course of action IMO...

[fmj50]

Sound like good advice guys, thanks

I'm going to make a new prototype with 1" thickness at the gas area and test, test, test....

[SA Friday]

Clamp on is working fine on the SKS front sight i make all over US and Canada. It's the same basic design made from alum. extrusion and 2 8-32 socket head cap screws.

These are just clamp on sights. What you have on the AR is a gas elbow that just so happens to have a sight on top of it. Heat transfer is totally different.