I have a friend with a tanker M1 in 308 that's giving some trouble. It will run fine for a few clips, and then will have several malfunctions in a single clip (even when all the shooting is done with one single clip being reloaded, so it shouldn't be the clip itself).
When it malfs, the problems are similar, but not always the same. Most common is a failure to chamber a new cartridge - the it will extract and eject the fired case, but then the bolt will close on an empty chamber. It will also sometimes get a cartridge partway out of the clip, but the bolt will run along the top of the cartridge rather than properly grabbing the case head. It's like the cartridges aren't coming far enough up sometimes to meet the bolt.
The rifle has a brand new Wolff recoil spring, so that shouldn't be an issue. The ammo being used is both South African and Portuguese surplus, from lots that work fine in other rifles (including my own tanker M1).
Any ideas on how to fix this?
When it malfs, the problems are similar, but not always the same. Most common is a failure to chamber a new cartridge - the it will extract and eject the fired case, but then the bolt will close on an empty chamber. It will also sometimes get a cartridge partway out of the clip, but the bolt will run along the top of the cartridge rather than properly grabbing the case head. It's like the cartridges aren't coming far enough up sometimes to meet the bolt.
The rifle has a brand new Wolff recoil spring, so that shouldn't be an issue. The ammo being used is both South African and Portuguese surplus, from lots that work fine in other rifles (including my own tanker M1).
Any ideas on how to fix this?