Originally Posted by swatbwana
for a 16 inch gun you want a mid length gas system , the carbine system is too violent in a 16 inch gun.. It will shoot softer and prolong the life, also giving more dwell time to allow easier extraction.
More info can be found here:
| Carbine vs. Mid-Length Gas System on a 16" Barrel
| Advantages of Mid-Length Carbines for Law Enforcement Officers