Here's one you will not see every day. It's a Ruger 77/22 RSP made in 1990. The 77/22 has rear locking lugs and has a very fast lock time. This particular model combines the composite stock of the stainless guns with a blued receiver and barrel, which I prefer in the field. It will accept 77/22 or 10/22 rotary mags, and the banana magazines made for the 10/22. Its 20" barrel gets the most out of hi-speed 22LR rounds.
Not liking the 1" dangly swivels it was equipped with, I substituted 1.25" QD swivels - these fit my preferred GI sling arrangement.
I'm not sure if this variation is made any more. I picked it from a large batch being sold at a large gun show in June of 1990 as the one having the best trigger pull. Great gun, and extremely accurate.
John