The M70 Winchester having a cone breech, a la Springfield, has an extractor cut in that breech that may have a sharp edge or corner. That may snag a cartridge on feeding. Polishing, beveling, or breaking any less than smooth surfaces there is a must.
Ron aka "Rip" for Riflecrank Internationale Permanente NRA Life Benefactor and Beneficiary .458 Winchester Magnum, Magnanimous in Victory THE WALKING DEAD does so remind me of Democrap voters. Donkeypox.
