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Hi Franki and welcome. I would confirm with SilencerCo Customer Service at 801-417-5384. Cheers, stay safe and enjoy!

Hi Frank, I believe you need model AC24 for the Omega 45K, also out of stock at Bud's budsgunshop.com/product_info.php/products_id/1452/silencerco+osprey+octane+piston+.578x28+45+acp+stainless+steel , Available here >>> silencershop.com/silencerco-piston.html You can confirm with SilencerCo Customer Service at 801-417-5384 Stay safe & have a great day!