Rifle Buffer with Tungsten Weight(s)?

[BufordTJustice]

What would happen, say, if one replaced all the steel weights with tungsten (essentially making an H5 or even H7)? Would it run like an undergassed carbine with an H3 and PMC Bronze (frequent failures to feed)?

How does changing the buffer weight affect the recoil impulse? If it slows the carrier down enough, would it end up being something like the SureFire Long Stroke carrier system or the Ultimax 100 Constant Recoil system? Is there even enough "room" in the AR operating system to allow for something like that?

That would be far too heavy. It would basically make it a 13oz buffer. Too much.

To answer your second set of questions, there isn't enough room for that in the current AR15 platform.