gas block grub screw

[mikeshaw2]

Anyone know off the top of their head what size grub screw secures my AR's gas block to the barrel?

Timney says put a grub screw on top of the grub screw in their trigger assy to keep things tight. My gas block (BCM barrel/gas block) came loose the other day and I'd like to add another grub screw to the grub screw ala Timney to keep that from happening again

Thanks

M

 

[TheOE800]

10-32 x 3/16”

 

[Trigger Monkey]

I'm not sure there's enough meat there to add a second screw on top. I've used red loctite for ages without an issue and when the time came to take the gas block off some concentrated heat always worked to get the screw out.

 

[Cr1775]

Or a couple mag dumps that works with blue not sure about red, try it.

 

[Cr1775]

Best yet sounds like you need to dimple it and use the set screws that dig in and then dont worry about loctite, i dont think loctite does anything anyway because how much heat to put in the barrel when you shoot,unless you're at a range that says 1 round every 10 minutes no rapid fire.

 

[JS8588]

Best yet sounds like you need to dimple it and use the set screws that dig in and then dont worry about loctite, i dont think loctite does anything anyway because how much heat to put in the barrel when you shoot,unless you're at a range that says 1 round every 10 minutes no rapid fire.

That's why I use Rocksett.