I finally got around to building my 10/22 last night. I hopefully will get a chance to sight it in and test fire today. I used my new postal scale to weigh the rifles. My original weighed 4lb 13 oz. My cut down stock only weighed 3ozs less that my factory stock. By contrast the the entire Chipmunk weighs 2lb 10oz.
I put in a Volquartsen target hammer kit, and up graded the extractor with the Volquartsen kit. The big change was the Beyer lightweight target barrel. With the loss of iron sights I added a scope base and a Bushnel red dot. Without the sight the rebuilt rifle weighed the same as stock, 4lb 13oz, with the red dot the weight is 5lb 2oz.