A Subsonic 5.56mm AR – Part 2, by R.A.O.
(Continued from Part 1. This concludes the article.) AMMUNITION: STOCK UP ON 5.56 SUBSONIC AMMUNITION I like to use Beck brand subsonic ammunition as they are good quality cartridges and best for this scenario. Subsonic means that it doesn’t break the sound barrier so there is no secondary boom (or “crack”) when firing. The first boom (from the powder charge) is silenced by the suppressor, and there is no secondary hypersonic boom, beyond the suppressor. Hopefully, that makes sense to everyone. Use subsonic ammunition in situations where you need to be nearly silent. One caveat is that subsonic ammunition is …