Congrats on the new 15-22
Most UK .22 Rimmies are cut to 1/2 x 20 UNF threading, so there will likely be a mismatch between the rifle your dealer took the moderator off, and your 15-22.
Options would be to find a mod in 1/2 x 28, or to have the 15-22 barrel chopped & re-crowned/threaded (although that seems to be a bit of a faff) - I'm aware of Riflecraft (UK) having chopped and permanently modded some 15-22 barrels to the legal 12" limit if that takes your fancy...?
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