I noted there have been some previous postings on this caliber. Today I received some interesting data on the Blackout from one of my contacts. Seems some factions in USAF have recently become very, very interested in using it in a 9" (or shorter) barrel version of the M4 as a replacement for the MP-5 as used by OSI, etc., and also possibly for various special ops PDW applications. After looking over the data, it seems to have some real advantages over the 7.62X39 in such applications - no 5.56 bolt face or magazine modifications needed when used in the M4 configuration, and decent ballistics. Plus, a subsonic 220 grain version is available, in addition to 123 and 155 grain versions.
In the past USAF has, off and on, considered a weapon based on the AK-47 in 7.62X39 in this role, and also possibly in 6.8mm, but that never got anywhere. This one just might. AF can consider this as an Air Force-specific item and as such does not have to coordinate with the Army, which greatly simplifies adoption.
Has anyone here taken a closer look at the.300 Blackout cartridge yet? Opinions?