Quote Originally Posted by junglie View Post
Can anyone help me with my mod 50?? bought recently & after replacing the mainspring & piston seal noticed that the transfer port size is larger than the bore?(it's a 1980 .22) the rifle shoots harshly & won't make more than 7.5ft/lbs . I suspect some previous owner has drilled the port out too big, does anyone know the correct size for the port? I was thinking of siver soldering an insert the correct size in or welding up the hole with mig & re boring it. Either way it's not going to be an easy fix.
Hi Junglie
Opening up the port on the 50 must have been a very tricky job performed with a very long drill or reamer down through the cylinder.
It may not be a parallel hole and it will be difficult to silver solder a bush into but not impossible

Early .22 Model 50's were good for about 9.5 ft lbs and the latest one (with extended cocking lever)gave around 10.5 ft lbs in .22, so yours is certainly underpowered. The fact that it is harsh to shoot would point to too large a transfer port but I am unsure what it would normally be. I suspect 3 to 4mm would be pretty close to the factory size
John