Knurled tip gas block set screws

[Biggy]

Are these best used just once and then replaced? Also, are most gas block set screws the same thread size, and where can you get them in very small quanities?

[Clint]

They are best if used once, but they can be re-used with some loss in holding power.

We have them here (http://www.blackrivertactical.com/concrete5/store/#!/BRT-Gas-Block-Screws-2-pc/p/55442052/category=6464008).

[Biggy]

Excellent. Thanks