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Yes!!!!

Corey, this will fit the Sig M18 without issue. Just use a small dab of blue loctite on the opposite thread to prevent back out or loosening when firing. Cheers and stay safe!

Corey, yes sir, this will fit and function just fine on your sig M18. Hope this helps.

Corey, yes this will fit on your Sig M18. Have a great day!