Did a search and could not find the answer. All of the Colt 9mm buffers I have seen pictures of and the buffers in the kits all look like 2 pieces "pinned" together. I purchsed off the EE what was advertised as a Colt "latest" generation 9mm buffer and it looks different from others I have seen. It is a black one piece buffer(with a weight inside that moves when shaken).  no pin holding anything together. Is this truely a new Colt buffer or something else???(P.S. it functions fine, but the reason I am asking is I'd like to slow down the ROF on full auto and wondering if this is the best buffer I can get or do I need one of the 2 piece ones?) Thank you, vail.