Try some graphite powder before changing it. This is the correct stuff for lubricating the barrel. Kasp K30050 Graphite Powder by Kasp https://www.amazon.co.uk/dp/B01MYMZ2DI/r...yDbAM6FR53
The bolts will be anti tamper so will need to be drilled out, makes it a fair bit of work as the yoke needs to be on the bench.
The bolts will be anti tamper so will need to be drilled out, makes it a fair bit of work as the yoke needs to be on the bench.