Buy one of Ruger’s more basic 10/22 models, smooth internally the receiver’s sidewalls and ceiling, replace the charging handle/guide rod/spring assembly with Kidd stuff, and install Kidd’s Drop-In Trigger Kit into the OEM polymer trigger housing, along with your weight selection from Kidd’s Set of Trigger Return Springs. Now with far less potential for malfunction and without having to fight with an incredibly annoying OEM trigger pull, then find how well the factory chamber will shoot your preferred varmint thumping ammo, and proceed, or not, from there …
^^^^^^^ He has done 5 for me. Highly recommend. There is another guy out there( rimfire central forum) supposed to do good work, but I had all mine done before be started, so I can't comment on his quality.That’d be Randy at CPC, “Connecticut Precision Chambering”. If you’d like a ‘sleeper’, the outward appearance of an all OEM that will shoot as well as a great many high dollar FrankenRugers, consider sending in your barreled action with trigger for Randy’s “RUGER 10/22™ FULL TUNE-UP”.
http://www.ct-precision.com/