Advantages - Reduced muzzle flip, quicker follow up shots because of.
Disadvantages - Increased muzzle flash (at low light/night), Increased muzzle noise (louder).
I have my Casull Mag-Na-Ported. Wouldn't have it any other way.
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Schmit
GySgt, USMC(Ret)
NRA Life, Lodge 1201-UOSSS
"Si vis Pacem Para Bellum"