I see all this talk of the advantages of using a 9 mm buffer. I have "H" buffers in all my carbines. I see in the Brownell's catalog that a 9 mm Colt buffer is listed at just a little more than a rifle buffer (much cheaper than a "heavy" buffer listed elswhere in the catalog). Before I order, are these the heavier (5.4 oz.) buffers or do I need to go to another brand to get a heavy buffer. I've never had a malfunction with an H buffer but would like to try the heavier version.