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Isaac, yes Sir, Manual Thumb Safety is included. Cheers and stay safe!

These come with either the grip safety or thumb safety and in some instances both. This model does have the Thumb safety only.

Isaac, yes this model 13144 has an ambidextrous thumb safety. Model 13143 has no thumb safety. https://www.budsgunshop.com/product_info.php/products_id/129588/smith+&+wesson+13143+m&p+9+m20+compact+9mm+4+15%2b1+optic+ready+black+armornite+stainless+steel+slide+black+polymer+grip+n .....Have a great day!

Yes, this has an ambidextrous safety. Hope this helps.