Fake suppressor for airsoft L96

Here's a fake suppressor for airsoft L96. It fits good on my Well MB-01.
As I said this is a fake suppressor, it looks to be but in fact the barrel fits in, so the sniper only takes a few centimeters more than originaly.
How to install it ? Just take a flat rubber band and put it above the screw part (to make the suppressor grip the barrel better). Then screw (4mm screw needed and a nut). It's installed.