1. The Silencer Sound Standard is now 5 years old! Thank you for supporting PEW Science all of these years and helping make this the industry standard for silencer sound suppression performance.

2. Big thanks to Oklahoma State University! Engineering faculty and students attended our seminar last week – a very welcoming group of people who are learning about fire, explosions, and protecting the public! A great degree program for folks that are interested.

3. Sound Signature Review 6.181 – the Echo Zulu Defense X1R556-Ti on the 5.56 standard untuned mid-gas 14.5-in barrel M4A1. Another hybrid design. Let’s dig into the technical talk for this report published last week.

4. Sound Signature Review 6.182 – the Dead Air Wolfman on the HK SP5 – in both long and short configurations. Prolific submachine gun silencer? Absolutely. Misunderstood? Clearly. Let’s do a quick introduction to this technical report published concurrently with this episode.