Yep, you definitely need a slot on a section 1 FAC for a flash hider (comes in the same category as a sound moderator) s.57c of the firearms act if you want to look it up.
This is just a related post of someone else who queried it with the home office for your reference.
It might be worth contacting Killen Airsoft on IG... He's doing another run of them although he's based in Sweden. People seem to be happy with his work.
Real steel 249 para muzzle device and blank firing adapter
in Parts
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Yep, you definitely need a slot on a section 1 FAC for a flash hider (comes in the same category as a sound moderator) s.57c of the firearms act if you want to look it up.
This is just a related post of someone else who queried it with the home office for your reference.
https://www.stegough.com/flash-hiders-and-flash-suppressors-in-the-uk/