Do you plan on using a suppressor?  The H-buffer might help there.

The answer is...neither...  You need an X@D4 buffer for your specific application.

All you really need is a buffer that will cycle the gun at the full auto rate of 700 to 800 rpm or so.  16" midlength, yeah, that'd be all right.

Is the ammo dirty?  or is it clean?  if its clean, maybe go with a little heavier buffer.  If its dirty, maybe go with a little lighter buffer.

That's all folks.

Brett
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M4 feed ramps are almost a joke.  Yes they make the AR15 family as a whole (rifle/midlength/carbine/shorty/pistol) more reliable

BUT

However, they are not needed for 98% of applications.  It only solves at most, two OR Three, problems.

1.  The bolt carrier group outruns the magazine capabilities (or if you are an HK fan, "cartridge feeding device") at a rate which exceeds standard rifle feed ramp capabilities.

2.  Your ammo is too blunt nosed or has a particular feeding profile which, again, exceeds the capabilities of standard rifle feed ramp capabilities.

or

3.  They *might* just function as a crutch for your shitty ass magazines.

Brett

Oh, did you ever notice that *most* of the time, when you insert a magazine into the an AR15 w/M4 feed ramps, the magazine covers up the ramps?

So actually, all the M4 "enhanced" feed ramp ever did, was help cure misfeeds on the last few rounds in the magazines.  On full auto fire.  Carbine, higher cyclic rate, in cold weather.

And it actually did this, not by being extended down toward the receiver, but by actually being moved forwards, allowing for the oscilating?sp? rounds to continue up the feed ramp and into the chamber, as Mr. Stoner er (stoner, fremont, sullivan, etc) intended.

Huh?

And it was originally arose with a particularly *sharp* profiled round.  SS109 bullet.  Steel nosed penetrator round.  Very sharp nose.

my 2 cents worth.  or less.

Brett