I remain unconvinced he never obtained those DIAS's he was trying to buy illegally from an FBI informant days before the attack because his bump stocks weren't reliable enough (the bump stocks that performed so perfectly than experienced bump firers were at first convinced it was automatic fire), but yeah, slide fires were installed on all the guns.  ATF never inspected the guns, DIAS are not externally visible when installed, all we ever saw were pictures of the fully assembled rifles that the FBI released.

Even if they weren't installed, the presence of a 'gun walked' FBI sting DIAS MG at that crime scene would be an unimaginable scandal.  If one was actually installed and used with the bump stock in the latched position to kill people, the scandal would be more like "catastrophic."  There's evidence he was seeking the things, and we didn't get independently verifiable proof (if that's even possible with how untrustworthy the FBI is anymore) that DIAS were not present or used in the attack.  Keeping the secured-as-evidence untampered crime scene rifles away from the ATF trips my suspicions that the DIAS could have been discreetly retrieved long after the guns were solely in FBI custody, leaving no other investigators the wiser.

A gentleman doesn't tell the lady that plowing her is like throwing a hotdog down a hallway.

I keep hoping we see some stretched necks out of all this...keep being disappointed, though

You've got a funny definition of voluntary if you believe that it includes the threat of future force when caught with the contraband.

"If you don't destroy this today or give it to me, I'll imprison you or kill you if you resist if I catch you with it, or if you destroyed it but didn't keep proof."

Dont most lowers need to get machined for a dias?

Colt lowers do, I believe most patterns today will accomodate a DIAS (or maybe that's a LL?).  There's nothing intrinsically illegal/constructive in doing the clearance cuts; Colt did a CYA when the devices appeared, same as their hooked hammers, goody carriers, oversize FCG and takedown pins, and other groveling asshattery.

Either way, you'd never see the cuts unless the guns were taken apart; the DIAS stuff is entirely hidden from the outside.  A gun-walking gone wrong and subsequent CYA would certainly explain a lot of the overall weirdness & odd protocol involving the FBI.  If they did it for gun control AGAIN like with F&F, and got 50 Americans killed --can you even imagine the implications if that got out?

If you go back to the original thread, you'll see me calling it as a bumpstock based upon the audio.

I'm probably one of the most experienced bumpstock users around.

As far as DIAS go, I think it's pretty unlikely. All of the firearms he had would have required swapping FCG's and a few probably would have required lowering the shelf. If a swiftlink or DIAC was used, he would have had to swap FCG's on several rifles as many were high end models that came with nice two stage triggers.  A little practice with a bumpstock and he gets the full auto effects he wants, so why put both a bumpstock and a swiftlink in the rifle? More importantly, the audio is more consistently matched to the fluttering rate that happens when inconsistent pressure is made on a bumpstock - combined with a ramping that generally occurs with bumpstocks when ammunition from high cap mags is expended and the rifle decreases in overall weight.

I would have liked to inspect the insides of the rifles, but that won't ever happen. As an avid user and expirimenter with bumpstocks, I find the evidence consistent with bumpstock use.

It depends on shelf height. Low shelf lowers take a DIAS/DIAC without problems. High shelf lowers require machining.

Oh, I totally agree that what you say is most likely, and fully recognize that as you say, the 'truth' is now un-dis-provable because too much time has passed.  It's just...why was he trying to find an MG workaround in the days before because his stocks weren't reliable enough, when they ended up working better than almost anyone gets them to, while under duress/adrenaline, and with those damn Surefires?  I guess it's just the flip-side of the coin, where you see an oddly high number of malfunctions among mass shooters' guns, and this guy's equipment ran like oiled tops instead.

FWIW, any non-super-overgassed full automatic box fed gun also ramps up as follower pressure/friction decreases on the bolt, the more dialed in the operating energy, the greater the effect.  I recently saw one done with those new Schmeisser 60rnd boxes, and the ROF change was quite pronounced (but with a notable step up when the mag went from quad to double stack at the end)

Yeah, all auto's ramp as the mag empties. Gas systems and barrels are hotter increasing cyclic rate.

I've seen it very pronounced with heavy mags on bump guns. Sometimes they start out pushing ~500rpm due to mag weight, then ramp way up by the end of the drum. Bumpstocks get lots of speed variability just from the way they're held/pushed forward. Changes in forward pressure tend to show up quick.

I need to get my S60's out for some range days. Unfortunately I'm stuck with binaries these days.

Remember it was the so called Great Conservative Reagan who banned MG's.

You can blame Trump when Dems in power and they EO ban all guns

I'm sitting out this election. I can't vote Dem, and I sure as hell not voting Trump again.

Yea, I don't get why people want to look retarded by claiming they were not used. We still have dipshits that claim the shooting video "didn't sound like them at all".

It is like thinking you need to claim AR-15s are NEVER used in crimes at all in order to have some argument against banning them.

And it makes them look like rubes.