I run the RRA 2stage with 3.5lb springs in my .223 bench rifle and love it. Light and crisp break. I ran a stock RRA 2 stage in my 15-22 and also liked it over the stock polished trigger with 3.5lb springs.
If it is the MOE version, then it's a PITA pulling that tiny end of pin down further than the lever pushes it.
Here's the MOE or CTR stock and instructions on the pin:
RifleGear - Installing the Magpul CTR Stock
A little while ago, aluminum dust covers for the 15-22 showed up on ebay and I purchased one. Here's the review:
Short Story - Not happy with this product. Finish scratches off easily and is not properly machined to be mounted with the screws they provided. Not an issue if you use the...
Had a rra 2 stage in my 15-22 and the hammer spring is pretty rugged. You can swap out the springs with jp 3.5lb yellow springs to reduce the"hammering" on the firing pin.
BTW The magpul check riser interferes with tge charging handle when the stock is fully collapsed. I found that the 1/2" riser was too much for my PA M4
I went with the m4 due to it's smaller dot size and use of a common AA battery. I like the m3 mount better though, how it allows you to mount it further down the receiver but keeps it off the hand guard
I had to trim back the magnifier PA mount to keep the magpul rear site, magnifier, and m4 mounted to the receiver only. Wanted to keep the optics off the hand guard.
I'm curious how well the finish will match. CP's and yours appear to be a nice match to the receiver and both magnetic inlays are much cleaner than that ebay one.