TX200 MKI had iron sight option & standard baffles question

Sights were offered as an option on MKI. I don't know how they were attached by factory but I know what I want for mine. 
I see it would be very easy to add a front post or dovetail.

The baffles. One end cap and should there be a space between barrel and that end cap or continuous baffles?

Any improved air stripping or shroud venting experiments ever done by anyone here?