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One of the key upgrade components to the Special Operations' SOPMOD M4 Block II upper was the "SOCOM profile" M4 barrel: a heavy barrel with M203 cuts.

It's been said in civilian circles that this heavy profile barrel has sub-MOA capabilities, creates a rifle that can substitute machine gun fire, and will hold tighter groups when the rifle is heated up.

Is this fact or rumor? (because we couldn't' find any type of military published documentation stating any of those benefits) Was it purely to mount a short M203 on?

We find out.

We'd like to thank Jeff G at @moderntacticalshooting and Ian at @forgottenweapons. Thanks to their input for confirming and expanding on some of the points made in this video!

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