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Julia, I used the Viridian Green Laser and am satisfied with the performance : https://www.newegg.com/Product/Product.aspx?Item=9SIA25V8H27122&ignorebbr=1&source=region&nm_mc=KNC-GoogleMKP-PC&cm_mmc=KNC-GoogleMKP-PC-_-pla-IPC+Store-_-Flashlights-_-9SIA25V8H27122&gclid=EAIaIQobChMIxpHb-OSf4QIViYizCh1sIw2UEAQYASABEgK0KPD_BwE&gclsrc=aw.ds

Crimson trace has may lasers that will fit and work just fine but if you have not bought the gun yet I suggest getting the gun with the crimson trace laser from the factory https://www.budsgunshop.com/catalog/product_info.php/products_id/95476

Julia - Thousands of the Shields have lasers installed ... Since S&W now owns Crimson Trace, you will get the very best deal possible buy buying a Shield with the CT laser already installed, and the ones which activate with a switch under the trigger guard are the best possible configuration. https://www.budsgunshop.com/catalog/product_info.php/products_id/49332/smith+and+wesson+m%26p9+shield+m20+9mm