They completely solve the problem of the residual gas left that can happen with level 10 when you want to take the valve out and are easy to use. Nice well made bits of kit. Tunaman even had the special fittings I needed to put it inline so that the proconnect wasn't right next to the valve spoiling the looks of my gun

here's a pic on my gun...
manike
It's actually very difficult. This thing is so shiney that I just get glare and reflection off of it with any flash, and in the current indoor/winter night light I can't get any great pictures without a flash... But I took some anyway so you can see it and when I get chance to put it in natural light I will take some more.
I had it in my z-grip but that's a bit battered no...
