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AR-15 Upgrade Bundle by Pew Pew Tactical
5.56 NATO is loaded to higher pressures and typically has a different chamber spec. .223 Remington is a civilian chamber spec. You can safely shoot .223 Rem in a 5.56-chambered rifle, but firing 5.56 in a rifle marked only .223 Rem is not recommended.
M193 is a 55 grain full metal jacket round commonly used for general training. M855 is a 62 grain green-tip style round that uses a steel penetrator in the core and offers different barrier performance. Pick the load that matches your use and any range restrictions.
40 to 55-grain bullets are common for varmint and general-purpose work. 62 to 77 grain bullets are popular for longer range precision and hunting. Match your choice to your barrel twist rate for reliable stabilization.
