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Mostapha, This a fantastic firearm, but it does feature a commercial diameter buffer tube and interior butt stock diameter not mil-spec.
Mostapha, this CORE claims to adhere to Mil-Spec. I would confirm this directly with CORE. If you have questions regarding parts used to build a rifle please give us a call at 352-401-9070 Ext. 200 and one of our receptionists can transfer you to the appropriate department.***
Mostapha - These days, who knows. Some of these companies are using whatever they can pick up at a lower price ... I would recommend to get the UPC and model number ready, then call CORE at 352-401-9070 Ext. 200, and ask them. It would be interesting to see what they say.