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Yes that'll fit and function in your M18 with no problems, the loaded chamber indicator will function just fine as well.

Earl, this should fit as a drop in no issue. Loaded Chamber Indicator should not be affected in any way. I would confirm before purchase directly with Sig Sauer Customer Service at 603-610-3000 option 1 Monday-Friday, 8:30am-5:00pm EST. Online inquiry is here : https://www.sigsauer.com/customer-service-contact