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Hi Michael and welcome. I would get accurate information directly from Radian Weapons at 503.893.2987 or by email inquiry at -- support@radianweapons.com --------- Cheers and stay safe!

Hi Michael, The Shadow Systems MR920 will require the Gen 4 Ramjet, not the Gen 5. budsgunshop.com/product_info.php/products_id/147553/radian+weapons+ramjet+afterburner+combo+barrel+%26+compensator+black+fluted+stainless+steel+for+glock+19+gen4 , Stay safe & have a great day!