If you want it... make it 
The way I see it, it's a Restricted firearm already (your not out and about)... people are going to hear "BANG, BANG, BANG!" at the range and then look like an idiot if they declare it a silencer.
Chance of Police coming to get you... very unlikely.
Now, if the Police ever visit your home to search your firearms, you might have some explaining to do. Chance of this occurring? Only you know
The way I see it, it's a Restricted firearm already (your not out and about)... people are going to hear "BANG, BANG, BANG!" at the range and then look like an idiot if they declare it a silencer.
Chance of Police coming to get you... very unlikely.
Now, if the Police ever visit your home to search your firearms, you might have some explaining to do. Chance of this occurring? Only you know