Got the answer....it is there for differing trigger guard setups.
The E-model receiver has an unused threaded lug between the two lugs that are in use. I understand the E receiver is used for 4 rifle models. I assume the lug not used in a mark II .22LR FV SR is used on another model? It looks like I could drill the bottom plate and stock and add a third bolt. Might be a way to improve receiver stabilization.
Got the answer....it is there for differing trigger guard setups.
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