The only parts of the ILS that remains after installation of the plug is the fork and it's spring. This holds the lock in place and serves the same function for the plug. It's held in place pretty solidly, I don't think it would be a problem. I believe most (all) of the problems have been caused by the flag jumping up into locked mode during heavy recoil, it's only held in the unlocked position by a tiny spring. I hope this helps.
Paul
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