*PLUMBERSSTOCK EXPERT* responded:
Hi, there! Thank you for asking PlumbersStock.com. Yes, it will fit the Milwaukee 6509-22 sawzall and yes, it is an OEM product. If you're ready to purchase, feel free to click "Add to Cart". Enter your zip code on the next page and you're all set. Thank you and we hope to see you shop with us again here at PlumbersStock.com!