Yeah, I did see that video.Carefull with the FMA giggles, the lens will mark and 'dent' check out a video by a French guy in Airsoftpeak
I posted it up before on here, just use search function, it may show up
Let me know how you get on anyway as I can't get ESS or locusts in tan so this was a cheap option
I think you can fit ESS or smiths lens but they need modification
It did make me wonder about them, but the guy had a 400fps rifle with his flash hider right up against the lens, so I would say that would only be extremely rare circumstances.
I'm hoping 350fps from 15ft away should perform better.
A fella called Airsoft mike did another video with a Glock 18 from 6ft and they performed much better. I'll report back anyway, I'll give them a test in the garden before taking them out for a game.
Otherwise I'll go straight to the Bolles.