Carbine Buffers

Relatively new to building AR lower. I have dealt mainly with rifles up to this point. M q is the carbine buffers. What is the H1, H2, and H3 buffers designed for? Different loads? Carbine vs Midlenght gas systems?

I have an A2 lower I’m converting to a carbine stock for an BCM LW middy upper.

Why not use the ORANGE SEARCH BUTTON and read a little. You have been a member here for quite some time and things haven’t changed.

I did. Didnt find what I was looking for.

No reason to be a jackass about it.

Strike me from the membership list. I have no desire to be associated
with the likes of you.