Bugger. If it helps I can take a pic of my mod? One thing that might stuff you up here is the relief cut in the front of the receiver ring that fits around the tip of the extractor. Depending on what you have, it may or may not clear the tip of the extractor as it tries to snap over the rim when you close the bolt. My M48a did have clearance, but if yours is marginal you might be squeezing the tip of the extractor on both sides which is not great for the life of the extractor...
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