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There's a couple aftermarket companies. I really like the Zev Fulcrum or the apex. https://www.budsgunshop.com/catalog/product_info.php/products_id/714007750/ZEV+FULCRUM+DROP-IN+9MM%28GEN3%29+BLK%2FRD

Remember to do the price match also to save a few bucks. I always price match "the-aromory" Drops the price to $139