Lock GBBR to semi auto only

[sonofsammo]

Apologies if this has been answered elsewhere, but I couldn't find it.
How can you lock a GBBR to semi auto only? Specifically the GHK G5 - I'm thinking of this with the 16" barrel but want it to remain legal!
Thanks in advance, 
Andrew

 

[proffrink]

You'll need a sear like this one:

https://www.milspecsolutions.co.uk/fg-airsoft-ghk-g5-semi-auto-only-sear.html

Legal as what? A DMR?

 

[sonofsammo]

Nice one! Thanks for the link.

Possibly DMR, but I thought that anything over 370 wasn’t allowed full auto?

So as it would be capable of over that, I figured the best way to stay legal would be to restrict to semi?