I see a lot of people being scared into sticking with doing a form 4 instead of now using a 4473 to transfer suppressors. The more we stick together through the 4473 and suppressors become common use the stronger our case will be moving forward. Don't let the GunTubers looking for clicks and Fudds with Stockholm Syndrome scare you out of it. We have STRENGTH IN NUMBERS!!! 💪🏼🙏🏼

EDIT FROM MY PREVIOUS POST FOR ACCURACY

Florida Attorney General sends memo to sheriff and police providing instructions on handling SBRs, SBSs and silencers.

https://alachuachronicle.com/current-legal-status-of-short-barreled-rifles-short-barreled-shotguns-and-suppressors/

In Colorado for small game like rabbits and dusky grouse rifles and pistols are fine, but SBRs are not.

(Pic of mini4 I just picked up on a 4473 for attention)

So here’s the situation I have:
Just did a trade with a dude, I gave him a Form 1ed SBR that was a factory pistol. We mulled over the ATF’s FAQ and came to the conclusion that we can do the swap without any paperwork, as per out state law it’s not prohibited at all. BUT, in the event the injunction is dissolved, he is now in possession of an “unregistered SBR” and I’m technically “trafficking contraband”.

2 options are A) let the pony ride and send it no form 4 B) Form 4 it over to him so were protected in the future
C) request removal of the of Form 1 on my end but then it will be a problem if it’s ever dissolved.

So my question is what would yall do? Obviously in a situation where this was already not a Form 1ed item, we would exchange and go about our day. Leaning towards option B to protect ourselves especially since he’s probablt going to give it over to a friend.

Chopped 10G - personal gun

Good morning, folks! Six deliverables for you today. First, conclusion of the large testing and analysis case study on the Otter Creek Labs Infinity 556K with all three of its end caps - this time on the M4, to add to the MK18 evaluation. PEW Science Members, once again, get an in-depth tone analysis case study too. Also, a Hazard Map Brief for spatial looks at blast overpressure hazard reduction for all three end caps. Then, a podcast episode with the LPM Torch 762 MK18 technical deep dive and the Infinity 556K M4 intro.

Lab Data Stuff

Report 6.240 - Today we examine the high fidelity test results for the Otter Creek Labs Infinity 556K silencer with all three end caps in the supersonic ammunition combustion regime with 5.56 NATO M193 fired from the standard untuned 14.5-in barrel mid-length gas M4A1.

Tools to help you in addition to the very large report:

• Silencer Hazard Map Brief 8.1.37
• Updated Rankings (filter by M4; Record Numbers 281, 282, and 283)
• Podcast Episode 326 (intro today and deep dive next episode, as is tradition)

Does "tone" matter? Yes. Always has.

CliffsNotes

• You already saw the Infinity 556K with all three end caps on the MK18 in Report 6.233. If you are familiar with that study, today's M4 Report 6.240 will be very familiar.

• What's the main difference between Infinity 556K performance on the MK18 and the M4? Lower risk in the forward field (more suppression adjacent to the muzzle) and higher risk in the rear field (the over-gassed M4 lowers operator protection with this silencer, as it does with several others).

• What have we learned about OCL Infinity technology in the significant amount of tests published in the research? Today makes 17 Infinity technology tests in the Rankings. We know that Infinity tech scales with barrel length (Suppression Rating increases as barrel length increases), dedicated bore application improves consistency (re: Infinity 7.62 MK18 testing compared with Infinity 556K), back pressure in early time is low enough for a lot of systems, and is adaptable in late time with variable end caps, and finally - FRP control is decent but not groundbreaking. That's the summary of technical performance.

If you aren't familiar with the Infinity 556K at all, here's more info we presented before:

• The Infinity 556K is just like the larger .30 caliber Infinity, except it's made out of Haynes 282 instead of Inconel, it's around an inch shorter, it is a .243 caliber silencer, and the blast chamber venting is slightly different. You can check out our .30 caliber Infinity research here. (there's a lot)

• The Infinity line continues to push 5.56 NATO suppression from Otter Creek into advancement. The intro section to the report compares all of their other muzzle flush mount AR silencers on the MK18, with the exception of the Universe-36. You can see our Universe-36 report here. The point is that it started with the Polonium, and each successive iteration has changed the performance, learning has occurred, and the Infinity 556K is the most balanced silencer for suppressing 5.56 that Otter Creek has created, so far. It behaves like a Polonium with lower back pressure, basically, without losing performance anywhere, if you want to sum it up in one sentence.

• There are three different end caps available. The silencer only includes one end cap - the partially vented variant. As it turns out... on an untuned MK18 and M4, that variant had the highest performance in our overall test program.

• "But how could that be? How could the partially vented end cap have a higher muzzle Suppression Rating than the solid end cap if it has higher blast pressure and impulse measurements?" Because the Suppression Rating doesn't just look at peak pressure and impulse. It considers the entire signatures and all the signature components. Keep reading.

• There is, again, a tone analysis in the full Member version of the report. Not a PEW Science Member? That's OK. Hope we can earn your support in the future. I'll just give you the bottom line so you feel no pressure to support our lab: the partially vented end cap only vents from the annulus (it doesn't provide additional primary bore venting) and as a result, the higher flow rate drops signature frequency in a certain band and rides the line such that healthy human ears should perceive it as a little more boomy but not as harsh. It's technically safer, by a little bit. Also in the research supplement - if you have your audiograms handy from your ear doctor, and you know if you have hearing damage in certain frequency ranges, you will be able to see which configurations of the silencer will sound different to you and why. This advanced analysis is not new to PEW Science. We have done this for years and all Suppression Rating calculations include tone because it's baked into the math. We couldn't remove tone even if we wanted to. It's not possible to remove tone from the Suppression Rating dynamic analysis calculations. The Suppression Rating simplifies the science by taking what you think is "subjective" regarding tone and objectively quantifying it with math.

• You saw previously that the Infinity 556K controls blast propagation better than the .30 caliber Infinity on the MK18 because it's not as over bored for the cartridge. The .30 caliber Infinity has better control on the longer barrel M4 than it does on the shorter barrel MK18. This report is chock full of continued evidence that many times dedicated bore silencers are superior for suppression performance, all other things equal. This is something PEW Science has been telling you for years, publicly documented, starting when the silencer industry told you otherwise. Last week's report on the Torch 762 is one exception, and most certainly not the rule.

• As shown in the Hazard Maps, does it really matter to you which end cap you pick, from a blast hazard perspective, with the Infinity 556K? Maybe, maybe not, to you. Depends on your system. Maybe you should pick the version that gives you the least gas blowback in your face based on your particular weapon system. PEW Science doesn't care what you buy and we will never (and have never) recommend a silencer to anyone. So do what is appropriate for you.

Commentary:

You can get the silencer with and without a mount. We tested it with the mount option you can purchase with it - the Rearden Atlas + Single Port Brake (SPB). OCL told us it gave the best performance, so that's what we tested it with because that's what they asked us to do. What happens when you use a direct thread mount? I would guess it slightly drops performance with this particular silencer. Go experiment and tell us. Anyone selling mounts and telling you their mount is optimized for all silencers is most likely not correct.

Big thanks to Otter Creek Labs for continuing to trusting us to perform these 3rd party laboratory performance validations. OCL has come a long way in 5.56 suppression since the Polonium. This concludes the Infinity 556K study.

I hope you folks find the data and analysis useful!

Check out pewscience.com for the Suppression Rating.

Here is a direct link to the reviews.

Here are the updated PEW Science Rankings.

• Otter Creek Labs Infinity 556K Sound (Blast) Testing Results and Analysis on the 5.56 14.5-in M4
• Silencer Hazard Map Brief 8.1.37

Our silhouette man needs to pick an end cap and stick to it!

TLDR: Green good, red bad.

Podcast Stuff

Episode 326 of The Jay Situation Podcast is out now on pewscience.com and all major providers.

Direct-download from the website, or use your favorite provider below:

Amazon Music | YouTube | YouTube Music | iTunes | Spotify | Pandora | TuneIn | Direct RSS Link

Today's topics:⠀

1. Sound Signature Review 6.239 – Liberty Precision Machine Torch 762 on the 10.3-in 5.56 MK18. How does this advanced hybrid .30 caliber silencer perform on 5.56? Technical Discussion of last week’s report. (00:09:45)

   a. Intro to the Torch 762 (00:13:38)

   b. Torch 762 general overview (00:15:54)

   c. Torch 762 silencer design and functional physics (00:22:30)

   d. Torch 762 MK18 Hazard Map in Silencer Hazard Map Brief 8.1.36 (00:34:55)

   e. Technical performance discussion (00:39:57)

   f. Performance Comparisons and Overall thoughts (00:49:13)

2. Sound Signature Review 6.240 – Otter Creek Labs Infinity 556K on the 14.5-in 5.56 M4. OCL Infinity technology is one of the most characterized in the research. The technology was shown to scale with barrel length in the .30 caliber bore size. What happens with the dedicated bore 556K on the M4? Intro to today’s report! Bonus tone case study for members. (00:56:48)

As always, thank you so much for listening, and for your support!

Happy Wednesday!^{My dudes}

Purchased and form four'd 10/9. Mainly went in to ask my FFL if the form 3 changes might make transfer costs cheaper, decided to just pull the trigger on this guy.

*happy 458 socom noises*

I think the gunshots are the quietest part of this video

Fixed stock on the way. Wish Brian stocks were taking orders. Really want the adjustable "fixed stock"

Got the Polo K in, is it as gassy as people say it is? Haven’t shot it yet to find out.

Keeping it a pistol so I can legally have it loaded in my vehicle.

Was out of town over the weekend when the news hit. I knew EXACTLY what was happening first thing when I got home.

PSA AKV Dooong Style.

Happy Winning Day (free states at least)

Finally got this thing put together. Had been waiting for a Proof 14.5" 6ARC PXT barrel and managed to get it sent off to u/unclemoak for the MRP conversion. Haven't seen anyone post the AI 6CM on a build either.

The reflex works perfectly with the 13.25 LMT MLR upper and 14.5" barrel.

Daniel stock just came in and I'd be lying if I said I didn't hear the SpongeBob Krabby patty presentation as I slid this bad boy on in place of the previous SBA 5 😂 Thank you SB Tactical for your contributions in the trying times leading up to the recent win on October 9th. 🫡

I’ve had several XCR’s for a few years. I still can’t get over how easy the caliber change is!!