Smallest .875 gas block?
- Thread starter PNW_Steve
- Start date
Superlative arms pinned model is one of the smallest. Generally a pinned ( superior to clamps in everyway, I will die on this hill) is going to be lower profile than clamped.
Thanks for the suggestion but pinning a gas block is not going to play on my CF barrel.
Been looking at the Troy Micro. Any thoughts on that one?
Because he doesn't understand that even though its a CF barrel, there is a steel gas journal.
Oh that was rhetorical LOL
Oh that was rhetorical LOL
Why not? All of the CF barrels I have seen on ARs have a full round Steel Section that supports the gas block.
Thank you for the education 
You are all right. This is my first CF barrel and I did not notice the solid section.
If I go that route, I am going to have to find a gunsmith as that job is beyond my skillset.
Any chance someone here knows a reputable gunsmith in the Fort Smith AR or Poteau OK areas? The last one I tried here damaged an expensive barrel.....
You are all right. This is my first CF barrel and I did not notice the solid section.
If I go that route, I am going to have to find a gunsmith as that job is beyond my skillset.
Any chance someone here knows a reputable gunsmith in the Fort Smith AR or Poteau OK areas? The last one I tried here damaged an expensive barrel.....
Its extremely easy. If its a proof prefit barrel then it already has the first dimple.
Install gas block, install first set screw.
Then take a drill bit slightly smaller than the ID of the set screw hold and just dimple the barrel. You are just creating a crater for the set screw to seat so the block cant rotate. Then loctite the screws and torque down.
Install the gas tube and slide into upper.
Install gas block, install first set screw.
Then take a drill bit slightly smaller than the ID of the set screw hold and just dimple the barrel. You are just creating a crater for the set screw to seat so the block cant rotate. Then loctite the screws and torque down.
Install the gas tube and slide into upper.
Set screw is "pin". There are also pinned gas blocks (where you drill a hole and put a long pin in ) but that's overkill.
This is what you want, in whatever color/coating you want:
This is what you want, in whatever color/coating you want:
The barrel is dimpled for a setscrew gas block. The question was about drilling for a pinned gas block.
If I opt to go with the setscrew attachment, I can do that myself. Probably use Rocksett instead of Loctite though.
Thanks
I was referring to the method where you install a pin that penetrates both the barrel and the gas block. Hence "Pinned".
Yea pinned is pretty much obsolete at this point. Its only done on hard use military rifles like the M4/M16 and really is not needed on a precision rifle. Set screw loctighted is not going to move or turn like a clamped will. It also makes it almost impossible to install the block incorrectly, as the gas port will be lined up with the block hole, unless your barrel is drilled incorrectly.
Makes sense.
Set screw attached Superlative gas block.
I can do that
I am going to stick with Rocksett on the threads. Gas block can get hot enough to soften Loctite.
Thanks Everyone
It only has one. it appears to be directly opposite from the gas port. I can mount the gas block using one screw in the dimple and use the second hole as a guide to drill a second dimple.
That’s the point. It provides you a reference point to center the block and then you can align whatever block you choose. Some even come with the pinned slot to facilitate doing that if you wish.
I'd leave it with just one dimple. If you ever change gas blocks the hole centers may have different spacing.
Drill jigs with different spacing resolve that. How many times are you going to swap gas blocks in the life of the barrel anyway? With that said, I have a barrel that has overlapping dimples for .400 and .450 from swapping gas blocks due to HG interference.
The first set screw is always 180 degrees from the port, it is how the port is drilled in the gas block.
I'm probably a lot more likely to swap gas blocks than I am to have a problem caused by only having one set screw in a dimple. I've got a fleet of barrels without any dimples and no problems, so one dimple is an upgrade that is plenty sufficient for my uses.
