I thought my Sport 127 had a problem with the with the barrel lock up. Turned out it was the O-ring that was used in the breach seal was slightly too...
Blockage is around 4in from breach and seems around 1in thick, judged by rod from muzzle. Ive cleaned no end of dust, con webs and milled grain from...
Theres ways to improvise with more common house tools, keep condiering making a crude lathe myself but not got past the thinking stage yet, grinding...