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Check out the ruger 556 https://www.budsgunshop.com/product_info.php/products_id/120317/ruger+-+ar-556+5.56+nato+16.1+black+b5+bravo+stock+lite+free+float+m-lok+handguard+30-rd

Hi Rich and welcome. Under the MLOK Handguard is a "Carbine Length Gas System. Cheers, stay safe and enjoy!

Hi Rich, this uses a carbine length gas system. Stay safe & have a great day!