[Charles Martel]

[going hot]

how do you get the pattern on the glass, or is that an insert or protective cap under the flip ups.

[lentulusgracchus]

Stevie_d, take a look .... remind you of anyone you know? That Killflash and the coatings are interesting.

I think there's a variety of Killflash that comes as a 50mm snap-on, instead of threaded.