I can't find that specific model, but the "tactical" 10/22s on Ruger's site that have flash suppressors have screw-on flash suppressors. It's a different part number from the SR-556 flash supressor.
Author, The NEW! AR-15 Complete Owner's Guide,
The M1911 Complete Owner's and Assembly Guides,
The M14 and M1 Garand Complete Assembly Guides
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