Hello Bushbaby, welcome to our forums, we're glad you found us. Feel free to make an introduction post and share a little information about yourself with our community of sharpshooters.
To answer your question,
Check the threads on the Kings Arms Silencer, and check the inner threads on your L96. Chances are you have one with a blaze orange cap, by using an adjustable wrench.. Youl "Should" be able to unscrew it, it might be a little hard, but it's possible.
once that's off, check the inner threads. If things look right, just screw it right on. If not.. Going to a Home Depot or a local plumbing store wouldn't be a bad bet (Getting PVC and foam).
I hope this answers your question. Cheers and welcome,
-Mosin
Airsoft Sniper Administrator