If you can afford it.. get one of each type of H buffer.

Reason: Because for some reason my BCM 14.5middy get really picky about buffer weight depending on the ammunition used.

example:

Winchester white box (Q1331a i believe) will not cycle properly with an H buffer in my rifle.

Lake City will.. go figure.

I'm sure there's a very cool and interesting reason that it does this and one of these days I'll address it.

For now ,,, I keep a normal carbine buffer along with my H's in my range bag.