A good friend and fellow shooter had a Numrich kit, which was a chamber insert and barrel liner. We got to yakking at the range one day about what to do with this rifle, and he suggested building an insert/liner set up like the kit. We took it to a mutual friend who had a machine shop and basically said we need this. A few days later we had the parts. Next up we drilled out the barrel and inserted a barrel liner from Brownells. The chamber insert and liner are epoxied into place as one piece. I got the bolt off ebay and we were good to go. That's really all there was to it.
It will shoot just aboout anything, and with match ammo it is surprisingly accurate. We have debated putting an A5 scope on her, maybe next year.
When I run our 22 steel shoot fundraisers, it is a very popular rifle to shoot. As mentioned in the original post it's used in the no balls challenge.
Love shooting this thing