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Looks like the Olight M2R Warrior is poorly designed in that respect at least... still, the maximum current that 18650s are rated for is typically in the 3-5A range, and I doubt it would be pushing that much current through saliva (you'd definitely feel a lot more than a mere stinging if it did). Anyway, the light the man had was an Olight T20 which does not have any kind of built-in charging functionality, the back of it has a standard forward clicky switch with a rubber boot covering it so there are no exposed contacts & it's rated waterproof to IPX-8, so it's unlikely that a short caused by saliva was a factor.

The cells mentioned are non-rechargeables so it's unlikely to be anything to do with USB charging. Plus CR123As would be much more likely to just explode mid-charge if you were to try recharging them anyway. I'd guess design flaw is also unlikely, as the light exploded in his mouth it was probably working normally (or at least appearing to) up to that point. Modern lights tend to draw a lot of current on high output modes though so it's quite possible the batteries were being overloaded. I'd recommend avoiding anything that uses multiple cells in series as that's where most the risk is, and only use cells made in Japan or the US (and watch out for counterfeit cells). Also make sure that you're not going to be drawing too much current from the cells... Personally, I've been avoiding non-rechargeable lithium batteries for years & only use protected li-ion cells in single-cell configurations or low self-discharge NiMH cells. Here's a particularly bad incident from a few years ago of someone getting hydrofluoric acid poisoning from some non-rechargeable CR123A batteries: https://www.candlepowerforums.com/vb/showthread.php?340028-Flashlight-Explosion (although it should be noted that this risk exists with li-ion batteries and other types of lithium cell too, including lipo batteries...)

As I said, the most likely scenarios are: - One battery discharged more rapidly than the other and subsequently became reverse charged (maybe they weren't balanced in the first place due to manufacturing issues, maybe heat from the light caused the first to discharge more rapidly, or maybe he mixed used cells or different brands?) - Too much current was being drawn from the cells and caused them to get angry Once they go up, they're in a sealed tube so you effectively have a pipe bomb at that point.

AFAIK that's how all red dot sights work... the difference between cheaper & more expensive ones is generally the quality of parts/materials (especially the glass - cheaper ones often have a noticeable blue tint to them and/or significantly darken the sight picture) and the overall build quality in general. In my experience the EOTech clone red dot sights are worse than normal red dots & I wouldn't consider buying one again; the ones I've seen all appear to have the LED positioned towards the front of the unit projecting the reticle on to the rear lens which then reflects it on to the front lens which in turn reflects it back to the shooter. As a result the sight picture tends to be much darker than other red dots due to the extra lens required, the emitter needs to be brighter to compensate for the extra losses, and there's more light projected out of the front of the sight from the rear lens.

It couldn't as the light would have been sealed, but even if it did somehow get into the light it's unlikely that it would have low enough resistance to cause major problems.

It's not an Olight-specific issue but an issue with lithum batteries in general. I think a lot of people just don't understand or underestimate the risks of lithium batteries if they aren't used properly/aren't used with sufficient caution or they use cheap or counterfeit cells. Also in addition to the explosion risk, some lithium cells have the potential to produce hydrofluoric acid if they go up in flames, which is something you *really* do not want to breathe in (or have any contact with at all really). https://www.candlepowerforums.com/vb/forumdisplay.php?107-Smoke-and-Fire-Hot-Cells-and-Close-Calls-The-dangerous-side-of-batteries&s=&pp=50&daysprune=-1&sort=lastpost&order=desc I heard about this incident a few years ago. IIRC the light had 2xCR123A cells, and from the sounds of things the most likely scenario is one cell ended up slightly more discharged than the other and then subsequently started to be reverse-charged. That, or the cells used simply could not cope with the current draw of the light. Either way, it resulted in at least one of the cells going into thermal runaway & venting. The light is effectively a sealed tube so pressure would have built up very quickly; the front and tailcap button are the weakest spots so one or both those would have blown out with considerable force as a result. Unfortunately, he had it in his mouth at the time...

I tested a few more brands of bio BB recently. Same caveats with limitations in equipment & methods apply as before: Tokyo Marui 'Perfect Hit' Bio 0.20g: These are quite pricey at £6 for 1600. The .25s weren't in stock when I ordered these so I didn't get any to test, but those are way more expensive at £11 for only 1300 BBs! They come in a sealed, vacuum-packed bag with some silica gel thrown in to protect them from humidity. Unfortunately I found a few in the pack with some surface defects. They weren't very big or deep & probably aren't rough enough to cause any damage, but they would most likely affect performance. I tested 20 BBs that did not have any visible defects. Weight: All measured 0.20g Size range: 5.93 - 5.96mm; 18 were within tolerance Roundness: 6 measured 0.00mm variation, 14 measured with max variation of 0.01mm There was no sign of swelling after soaking in water. Easily the most consistent so far, and I didn't find any air bubbles, although not all of them were within the 5.95 +/- 0.01mm tolerance (however readings of 5.93 could be borderline 5.94). Just a shame about their high price and the QC fails with some of them. Ares Amoeba "Diamond Precision" / "Match Grade" Bio BBs 0.25g: Before even opening the bag I could see these were off to a great start: I found a number of other BBs in the pack with surface defects, most of those merely had one or more slightly dented and/or scratched surfaces but some were spectacularly bad - especially this one: (it's even worse than it looks here but my crappy phone camera can't capture it well enough) They almost look like they've already been fired once then picked up and repackaged. Using BBs with surface defects like these have will cause increased wear on the gun's hop rubber or may even damage it and/or cause jams. It's possible these were simply from a "bad batch", but IMO there's no excuse for any BBs with such glaring external defects as these to go unnoticed. The bag was "sealed", but it has some air holes punched into it so ingress of humidity and/or dust/dirt is likely and could result in magazines, hop units and/or barrels getting fouled with whatever the BBs have picked up in storage, transit etc. - I did find some particles of dust/general debris floating about inside the bag with the BBs. I picked out 20 to measure and made sure that they didn't have any visible surface defects. Weight: Typically 0.25g, 5 measured 0.26g Size range: 5.92 - 5.96mm; 11 were within tolerance Roundness: 11 measured with max variation of up to 0.01mm, 6 with 0.02mm, 2 with 0.03mm, 1 with 0.04mm I didn't bother soaking any of these in water In addition to the massive QC fails in the pack, the consistency of these isn't all that great either. I did not find air bubbles in any of the BBs I crushed open. G&G 'Competition Grade' Bio BBs 0.25g: These come in a fully sealed bag similar to the one the Tokyo Marui BBs come in (and also includes a pack of silica gel like Marui's BBs), except larger & not vacuum packed. On the back is information about the BB indicating that they are made from PLA, and claims about decomposition times in different environments. I shook the bag & checked for any BBs with obvious defects a few times after opening the pack and as I took BBs out to test as I did for the others but couldn't see any. Weight: All measured 0.25g Size range: 5.92 - 5.96mm; 12 were within tolerance Roundness: 10 measured with max variation of up to 0.01mm, 10 with 0.02mm There was no sign of swelling after soaking in water. These BBs are reasonably consistent in terms of roundness; unfortunately a fair few were outside of the specified 5.95 +/- 0.01mm tolerance and I found air bubbles of varying sizes in 8 of the 20 BBs I broke apart.

I've been doing some comparisons of the bio BBs I have over the past week or so as well - ASG Open Blasters, BioSphere, Nuprol RZR Bio, all in 0.2 & 0.25g. On paper these should be identical - they're all supposed to be 5.95mm with 0.01mm tolerance either way - and while they all perform adequately enough at 0.2g in my experience from shooting them prior to the lockdown the ASG Open Blasters seemed to the best of the three, and the Nuprols had a habit of double-feeding sometimes. I haven't used the .25g BBs enough to have any idea which of those three shoots the best though. 20 of each BB were weighed and measured and they were broken apart to check for air bubbles. When measuring a BB's diameter I rotated it and re-measured to check the variation in diameter around it & get an idea of its "roundness", noting the min, max and average diameter. Some were measured then soaked some in water for >24h (was generally around 40h-ish) and then re-measured to check for any swelling due to water absorption. There are some caveats to keep in mind: The scales I used only have a 0.01g resolution which isn't really precise enough (and they're cheap, so they're not exactly top quality either) however they should at least be sufficient to show up any significant discrepancies between the specified weight and actual weight. They're also sensitive enough that things like airflow around them can skew the result. To attempt to compensate for these to some extent I weighed each BB repeatedly and used the most frequent result. Similarly, my digital calipers (Facom 1300EA) have a resolution of 0.01mm so borderline values might read either way, but again this should be enough to show any significant variation at least. Just because I didn't find any air bubbles in a BB doesn't necessarily mean that there weren't any; there could have been some in the parts of the BB that were not exposed or they may have been too small to see with the naked eye. Also, 20 BBs is a small sample size So this isn't exactly a rigorous, in-depth look & you shouldn't take the results as entirely accurate. Also they're likely to vary from batch to batch, with some being better or worse than others. But it should at least provide some interesting information & comparison between these three brands of BB beyond merely shooting with them Nuprol RZR Bio 0.20g: Weight: Typically 0.20g, 3 measured 0.21g Size range: 5.92 - 5.95mm; 11 measured within tolerance. Roundness: 13 measured with max variation of up to 0.01mm, 4 with 0.02mm, 3 with 0.03mm There was no sign of swelling after soaking in water. Nuprol's BBs have a consistent weight but their measured size was outside of specification on almost half of the BBs tested - minimum measurements of 5.93mm were not uncommon and a few were even as low as 5.92mm. None measured above 5.95mm. They are relatively soft though - I had to be very careful when measuring their size & shape as it was very easy to read lower measurements even with the small amount of force applied by the calipers. I did not see any bubbles inside any of the BBs tested. BioSphere 0.20g: Weight: Typically 0.20g, 6 measured 0.19g Size range: 5.94 - 5.96mm; all measured within tolerance. Roundness: All measured with max variation of up to 0.01mm (15 did not vary to an extent I could measure with my calipers) There was no sign of swelling after soaking in water. BioSphere's BBs are quite consistent in weight (trending more towards the lighter side) and impressively consistent in size/shape, measuring 5.94-5.96mm with no more than 0.01mm variation in diameter around any given BB - all within the specified 5.95 +/- 0.01mm tolerance. They readily split into fragments when crushed, and unfortunately I found a bubble in every BB I tested. Here's a photo of one that I managed to crack open more or less cleanly showing the air bubble: ASG Open Blaster 0.20g: Weight: All measured 0.20g Size range: 5.90 - 5.96mm; 6 measured within tolerance. Roundness: 9 measured with max variation of up to 0.01mm, 7 with 0.02mm, 3 with 0.03mm, 1 with 0.04mm There was no sign of swelling after soaking in water. The Open Blasters had a very consistent weight with all of them measuring 0.2g, but their size and shape varied to a greater extent than the Nuprols, from 5.90mm to 5.96mm. One of the BBs tested varied between 5.92 and 5.96mm! They seem to be of a similar material as the Nuprol BBs but a lot harder. I did not see any bubbles in any of the BBs tested. Nuprol RZR Bio 0.25g: Weight: All measured 0.25g Size range: 5.91 - 5.95mm; 3 measured within tolerance. Roundness: 15 measured with max variation of up to 0.01mm, 3 with 0.02mm, 2 with 0.03mm There was no sign of swelling after soaking in water. Unsurprisingly these are much like the 0.2g version - their weight is quite consistent while their size and shape is about as variable, though they seem to be a bit smaller on average and a couple measured as low as 5.91mm. The 0.25g Nuprol RZR Bio BBs are significantly harder than the 0.20g version and didn't deform so readily. I did not see any bubbles inside any of the BBs tested. BioSphere 0.25g: Weight: Typically 0.25g, 9 measured 0.24g Size range: 5.93 - 5.94mm; 16 measured within tolerance. Roundness: All measured with max variation of up to 0.01mm (17 did not vary to an extent I could measure with my calipers) There was no sign of swelling after soaking in water. These varied a bit more in weight than their 0.2g version, and like their 0.2g version trended towards the lighter side. Their size and shape was very consistent too with none varying by more than 0.01mm, although they were slightly smaller than the 0.2g version with all of them measuring between 5.93mm and 5.94mm. Unfortunately, just like the 0.2g version I found an air bubble in every one of these I inspected too. These were also much harder than the 0.2g version and they had a tendency to shatter suddenly once they started to crack but I did manage to break open cleanly for a photo: ASG Open Blaster 0.25g: Weight: Typically 0.25g, 6 measured 0.26g Size range: 5.90 - 5.95mm; 1 measured within tolerance. Roundness: 13 measured with max variation of up to 0.01mm, 4 with 0.02mm, 2 with 0.03mm, 1 with 0.05mm There was no sign of swelling after soaking in water. These seem to be slightly less consistent in weight than their 0.20g version, trending slightly towards the heavier side. Their size & shape is about as variable, ranging from 5.90 to 5.95mm and like the others these also trend slightly towards the smaller side. I did not see any bubbles inside any of the BBs tested. As I posted earlier in this thread, AFAIK most are made from PLA & as such I wouldn't expect them to biodegrade very quickly in the environment.

I've used 3 kinds of bio BBs (BioSphere, Nuprol RZR Bio, ASG Open Blaster; Open Blasters seem to be the best of the 3 in my experience) and did not find any of them to leave behind any crap in my guns' barrels. I always inspect and clean my guns after they've seen any significant use so I would definitely have noticed if they did.

I made my first order with Wolf Armouries recently & it's been a rather disappointing experience. I ordered a Tokyo Marui KSG from Wolf Armouries over the Easter weekend. They were doing an offer of 5% off guns/10% off accessories so the price was decent & I also bought an pack of extra shells with it. Shipment/delivery was fast (it was sent the following Tuesday and delivered the next day, Wednesday 15th) and it was well packed - all good so far. Unfortunately it looks like Marui's QC dropped the ball on this KSG as the one I received was defective - the pump locked up in the rear position before I was even able to fire it once In addition to that the gas tank seems to fit quite tightly and I had to push it out from the chamber side to remove it (it's possible that may just be because it's new and needs to be broken in a bit, but none of the reviews I read mentioned this and videos showed the tank popping out easily by itself when the release lever was pressed). Anyway I emailed Wolf Armouries about it and waited. A couple of days later I hadn't received any reply so that Friday I tried the contact form on their website in case my first email didn't go through or otherwise was missed (it was sent as a reply to the order confirmation). That message did get through to them and they sent me a reply a few hours later wanting my phone number so their engineer could ask some questions before they arrange a collection, however I didn't notice & reply to it until late on Monday because gmail had marked it as spam. I asked to deal with it via email as that would be a lot easier for me, and in anticipation of their questions described exactly what had happened with the KSG in as much detail as I could. I still hadn't received a reply to this by Friday - and I'd been sure to regularly check my spam this time so I wouldn't miss any more of their emails - so I tried the contact form again and included the reply with it. As of today I still haven't heard back from Wolf Armouries. I understand that things will be slower than usual due to the lockdown, but it's now been two weeks since the KSG was delivered and I first contacted them, and almost a week after I last tried contacting them, and I still seem to be no closer to getting this resolved.

Found these while going through some old backups from years ago.

My Tokyo Marui P90, my favourite & one of my oldest guns. Doesn't look much different to stock externally, but it's had a few upgrades: G&P metal upper receiver Prometheus 6.03 barrel, Prometheus purple hop rubber, AirsoftPro "stability snob" Guarder air seal nozzle, Guarder steel cylinder head, Guarder chromed cylinder Guarder polycarbonate piston with Systema Area 1000 aluminium piston head Guarder SP90 spring Prometheus bearing spring guide Systema oilless metal bushings Prometheus hard cut-off lever Stock motor & gears Wired with a basic MOSFET (IRF2804, used to have an active braking MOSFET module fitted but replaced it as it made the main spring make a "boing" noise after firing whenever it was fired on semi auto), blade fuse, Deans connector Does a little over 330fps

Built mine a few years ago now: Case: Corsair Carbide 330R Blackout Edition PSU: EVGA SuperNOVA 750P2 Mobo: ASRock X370 Gaming K4 CPU: AMD R7 1700 (mild overclock @ 3.7GHz) with Noctua NH-U12S cooler RAM: Corsair Vengeance 16GB GPU: Sapphire RX480 Nitro+ 8GB Storage: 1TB Samsung 970 EVO NVMe SSD, 6TB WD Black HDD, 1TB WD Black HDD OS: Linux Mint 19.3 Mouse: Logitech G203 Keyboard: Filco Majestouch-2 (Cherry MX Brown keyswitches) Monitor: Dell U2412M (24" 1920x1200 IPS)

Biodegradable BBs should get broken down by microbes present in the soil and various chemical processes into other materials. What they break down into and how long this process takes will depend on what exactly they're made of though, as well as the environment they're in. PLA is quite commonly used: https://en.wikipedia.org/wiki/Polylactic_acid Regular plastic will gradually break down in the environment too, but only into smaller pieces of plastic.