Swiss arms 180mm barrel extension and tracers

[AGR]

Good evening 

I'm interested in buying one of these barrel extensions. They have the correct width size for inserting my tracer unit. 

Does anyone have any experience of putting a tracer into this specific model?

Do the ends unscrew to insert a tracer? 

Many thanks 

A 

View attachment 113666

 

[AGR]

I bought it, and yes the front end unscrews so a tracer unit can be inserted.