My first entry here.
Lately, some of my friends asked me "Hey bro is that an M4A1?" whilst pointing to a Hk416. I can only say "No man, that's the Hk416!"
Let me tell you the differences. M4A1 has a delta ring, and Hk416 has none-instead the handguard directly connects to the upper receiver.
Nah, I know some of you guys already know the differences right? It's just my friends who didn't know the differences.