Quoted: Thanks for the tips guys.
What is an H-buffer and where can it be purchased?
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A heavy buffer or H-buffer is what ships with all Colt Law Enforcement Carbines and Military M4 carbines. It is simply a buffer that is heavier - this can enhance reliability and smooth operation.
It has an H stamped on it.
But I agree with firing a few hundred rounds of quality ammo like XM193 or WWB with the rifle exactly the way it is for several reasons.
1. To ensure everything works in original configuration to have a baseline and that no warranty work is needed.
2. To become familiar with the basic operation of the rifle.
3. to zero the rifle in basic configuration.
4. You paid a fair chunk of change for this firearm, so "don't fix it if it ain't broke" at least not until you know exactly why you want to change something. Don't upgrade for the sake of the upgrade. Your buffer should work just fine out of the box.
Make sure you field strip, clean away any cosmoline and heavy grease and lubricate very well with CLP before firing it the first time, they can be tight when new.
Also decide whether you want to zero at 25m or 50m, read iron sight zero procedures, and print out a copy to bring to the range with you, that way you will know how to adjust your sights. You don't need any tools, an FMJ 5.56mm cartridge will do for the front sight.
_DR