OK, I checked to be sure & I don't have a C50 Rice 42" here, but I measured a Colerain C50 and it is close to the chart they give & also looked at the chart Rice gave me & it is the same profile. I was sure it was but wanted to double check. I also checked a C54 in a 38" in the rifle I am building now that has a Colerain in it & the C54 Rice barrel fits in perfectly.
Now, normally I have to take out a lil wood here & there to fully inlet any of them, so most likely either barrel will work Unless the tang is fully inletted. In that instance it will not work as there is a Big dif. in the tang of a Colerain vs a Rice.
In quality of workmanship, IMHO the Rice barrel is Top Dog hands down... If you are shopping price then go with the Colerain. They are both good quality barrels, as are the Getz & the Green Mountain too. All of them will shoot more accurately than the general everyday marksman can hold them. :thumbsup: