FX Help! Removing Fx M4 barrel

You have to release the 6mm screw in the rear barrel housing. The M3s also had a twin barrel clamp at the front which needs releasing, but I don't think the M4 has this.
I’ve pulled the barrel out of my M3 without loosening those front “clamp” screws . Maybe the Saber top rail caused some deformation in the frame by incorrect installation. You’re supposed to tighten the screws from the middle working towards the ends.
 
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I’ve pulled the barrel out of my M3 without loosening those front “clamp” screws . Maybe the Saber top rail caused some deformation in the frame by incorrect installation. You’re supposed to tighten the screws from the middle working towards the ends.
I will lossen up the saber tactical rail screws and install again I'm like 90% sure it's that.
 
Barrel stick stuck, I have already remover saber tactical rail and screw and still barrel doesn't come put
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