Thanks Sacarathe, I'll definitively consider doing a video about! It doesn't obscure at all, in my G&P ACOG 4X I used to have a metal net as a home made killflash, not on the outside but stuck very close to the lens.
That way I kept it more low profile and secured the lens very well, with no sight discomfort at all!
I'm going to post in the Off Topic -> Media section from now on as I've been told by the mods to do so, feel free to catch up on the latest video there and thanks for your feedback!