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Aaron, yes to both ?'s Sir. Unboxing video of same Model 21189 here : youtube.com/watch?v=IF6JpthZoWE

yes a scope base is included and it is threaded for a muzzle device 1/2x28 thread pattern StockMagpul® Hunter Black Synthetic
Front SightFiber Optic Hi-Viz
Rear SightAdjustable Fiber Optic
MaterialAlloy Steel
Barrel FeatureThreaded Barrel

Thread Pattern1/2"-28
Capacity10
Twist1:16" RH
FinishSatin Blued

Overall Length35"
Barrel Length16.12"
Weight5.3 lb.
Grooves6
UPC7-36676-21189-0 https://ruger.com/products/1022Takedown/specSheets/21189.html

If it advertises a scope base then I’m sure it’s included. I’ve had 4 different 10/22 rifles and all came with their own base. This model is not threaded for amsuppressor.mit was my pleasure to assist you.