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Today’s Topics: 1. Listener Questions are back! We’ll answer more of your queries from the 6th solicitation. (00:10:32) 2. Sound Signature Review 6.142 – the Otter Creek Labs Polonium-30 on the standard .308 bolt-action. Introductory discussion! (00:49:05) 3. Sound Signature Review 6.143 – the Otter Creek Labs Polonium-30, again – this time, on the standard 5.56 MK18! How does over-bore influence the performance of this design? Introductory discussion of this study. (00:56:37)

Today’s Topics: 1. Sound Signature Review 6.140 – Combat Application Technologies CAT/SR/A1 on the 16-in .22LR CZ 452 bolt action. Technical discussion. (00:07:34) 2. Sound Signature Review 6.141 – Combat Application Technologies CAT/SR/A1 on the subcompact Beretta 21A semiauto .22LR pistol. Technical discussion. (00:56:18) 3. Some administrative items – thank you for your patience during this busy time, and thank you PEW Science members for your support and your donations. The effort continues thanks to you! (01:30:33)

Today’s Topics: 1. Sound Signature Review 6.139 – AAC M4-2000 Mod 08 (Unvented) on the standard MK18 5.56 SBR. Historical and prolific silencer! Technical discussion of this white paper published last week. (00:10:14) 2. Sound Signature Review 6.140 – Combat Application Technologies CAT/SR/A1 on the 16-in .22LR CZ 452 bolt action. Introductory discussion of this ultralight, wild silencer. (00:56:29) 3. Sound Signature Review 6.141 – Combat Application Technologies CAT/SR/A1 on the subcompact Beretta 21A semiauto .22LR pistol. Can the CAT SR do both? Apparently, yes… and then some. Introductory discussion for this interesting dataset. (01:10:14)

Today’s Topics: 1. New publication this week! Sound Signature Review 6.139 – AAC M4-2000 Mod 08 (Unvented) on the standard MK18 5.56 SBR. Long time coming; this extremely prolific silencer is now added to the pedigree. Introductory discussion. (00:12:49) 2. Sound Signature Review 6.137 – Resilient Suppressors Jolene on 20-in .308 bolt action. Technical discussion of the article published 17-JAN-2024. (00:25:23) 3. Sound Signature Review 6.138 – Resilient Suppressors Jolene on 8-in 300 BLK subsonic bolt action. Technical discussion of the article published 17-JAN-2024. (00:53:20)

Today’s Topics: 1. Sound Signature Review 6.137 – Resilient Suppressors Jolene on 20-in .308 bolt action. More 7.62 data is here. An ultra lightweight silencer… how does it perform? This is an introductory discussion for this white paper published concurrently with this episode. (00:10:06) 2. Sound Signature Review 6.138 – Resilient Suppressors Jolene on 8-in 300 BLK subsonic bolt action! Good golly, Miss Molly – both supersonic and subsonic characterization for this lightweight system. Bring the quiet! Again – introductory discussion – two publications today! (00:19:52) 3. Listener Questions are back! Let’s dive into more if your queries from the 6th Solicitation. This is a great time! (00:26:22) 4. The NRA had some nice things to say about the PEW Science laboratory in January’s issue of Shooting Sports USA! Great to see the effort get some recognition nationwide, spurred on by your support! (01:01:15)

Today’s Topics: 1. Sound Signature Review 6.136 – Resilient Suppressors Jessie’s Girl on the Beretta 21A subcompact semiautomatic rimfire pistol. This is the technical discussion for this white paper, published 03-JAN-2024. (00:08:30) 2. Gas blowback out of your AR-15 ejection port. Do you know why it happens? When you add a silencer, does it change what happens unsuppressed? How do you know how much it will change? What are the variables? Let’s revisit this basic discussion. Often requested by PEW Science members. Part 1. (00:39:59)

Today’s Topics: 1. Sound Signature Review 6.136 – Resilient Suppressors Jessie’s Girl on the Beretta 21A subcompact semiautomatic rimfire pistol! An interesting silencer – an interesting host – and an interesting test! Let’s kick off 2024 with the introductory discussion for this white paper, published concurrently with this episode. (00:08:40) 2. Happy New Year! So glad to be back with all of you – let’s take a dive into Listener Questions again! We’ll hit more from the 6th solicitation. All questions are submitted by the public; this is a great opportunity to learn about things that you may want to know about! (00:18:19)

Today’s Topics: 1. Sound Signature Review 6.135 – PTR VENT 3 on the 5.56 MK18. This is the technical discussion of this silencer and white paper, published 13-DEC-2023. Very interesting silencer – the Purposely Induced Porosity (PIP) technology apparently has some legs! (00:07:58) 2. Merry Christmas from the PEW Science family to you and yours. The holiday is this coming Monday – hopefully you are able to spend it with your loved ones. Rejoice! Thank you all for making this a great year. How are you going to take advantage of the holidays? Should you get a MK23? (01:00:07)

Today’s Topics: 1. Sound Signature Review 6.135 – PTR VENT 3 on the 5.56 MK18. This is the introductory discussion for this white paper, published concurrently with this episode! Low back pressure wars are heating up – this is a very interesting time in silencer history. Which technologies demonstrate the highest degree of efficacy? (00:08:33) 2. The Surefire SOCOM556-RC3. PEW Science will be testing it, due to extremely popular demand from members and the public. The test specimen has been acquired. In the meantime, let’s talk about flash. This is topical due to a recent Surefire social media post highlighting the flash reduction phenomenology of the system (or lack thereof in certain configurations). (00:22:12)

Today’s Topics: 1. Sound Signature Review 6.134 – SilencerCo Velos LBP on the 5.56 MK18. This is the technical discussion for this long-awaited white paper, published last week! Again, big thanks to PEW Science members for making research like this possible. (00:08:53) 2. Sometimes it takes a village – KAC silencer system testing is in the works, with contributions from several folks! KAC 556 QDC-CRS/PRT, 556 QDC/MCQ-PRT, and in addition to MK18 and M4A1 midlength 14.5, maybe we do SR-15 Carbine MOD 2 14.5 and SR-15 CQB MOD 2 uppers for members. Oh, and MAMS and 3-Prong. Thanks to several PEW Science Members for making something like this possible. (00:59:51)

Today’s Topics: 1. Sound Signature Review 6.134 – SilencerCo Velos LBP on the 5.56 MK18. This is the introductory discussion for this long-awaited white paper, published today with this podcast episode! Huge thanks to PEW Science members for making this research possible. (00:06:04) 2. Listener Questions are back! That’s right – it’s time for the 6th solicitation. Fresh off of the presses, we just gathered all of your questions earlier this week, so we’ll kick off answering some from this new batch right now! If you didn’t get your question in this time, don’t worry – there will be more opportunities! (00:16:04) 3. Thank you for all your support – consumers, dealers, distributors, and manufacturers – you are all making this happen! It’s been a great year and it’s not even over yet! The state of suppressed small arms research is in your debt. (00:57:55)

Today’s Topics: 1. Sound Signature Review 6.132 - BOSS Silencers Chairman (7.62) on the .308 bolt action. This is the technical discussion of this white paper released last week. A Tesla valve design principle? Maybe, but not exactly. (00:07:05) 2. Sound Signature Review 6.133 – BOSS Silencers Guillotine (5.56) on the 5.56 MK18. This is another silencer with analysis published last week – and this is the technical discussion for that article. (00:27:11) 3. Whitetail deer season is in full swing! I just had a great weekend hunt. Used traditional tools, with a silencer, during the day. At night? Advanced tools with silencers and thermal. Be the apex predator your tribe wants you to be. Hunting story time! (00:41:12)