silversquirrel
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Ok, sounds good. There is a dimple on the barrel, at 6 o'clock.I use 600F red loctite (272) on the bottom half of the barrel (careful to make sure it does not get in the hole). I use purple loctite (222) on the set screws themselves. The problem with using blue is that the torque required to break blue is higher than the maximum torgue of the hex set screws so you risk stripping the head when you remove it.
The red on the barrel is not "necessary" but means you are not relying on the set screws solely to keep the gas block in place. If you have a dimple on the barrel in the right place (a dimple in the wrong place is worse than no dimple) then the set screw is giving some legitimate mechanical support. The other option is to drill the block/barrel or get a block predrilled and just drill the barrel. That will give you true mechanical support.
But the short answer is 272 on the barrel (avoid the gas opening) and 222 on the setscrews is what I do
Hopefully the dimple aligns to the set screw with the block flush against the collar. I have seem them off so you end up unable to use the set screw because it will offset the gas block and cause it to be out of alignment with the gas hole in the barrel.Ok, sounds good. There is a dimple on the barrel, at 6 o'clock.
Thanks!
It does. I put a mark on the gas block, and one on the barrel to align the holes, then tightened it up slowly and the set screw seated in the dimple.Hopefully the dimple aligns to the set screw with the block flush against the collar. I have seem them off so you end up unable to use the set screw because it will offset the gas block and cause it to be out of alignment with the gas hole in the barrel.