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Freediving blackout, breath-hold blackout or apnea blackout is a class of hypoxic blackout, a loss of consciousness caused by cerebral hypoxia towards the end of a breath-hold (freedive or dynamic apnea) dive, when the swimmer does not necessarily experience an urgent need to breathe and has no other obvious medical condition that might have caused it. It can be provoked by hyperventilating just before a dive, or as a consequence of the pressure reduction on ascent, or a combination of these. Victims are often established practitioners of breath-hold diving, are fit, strong swimmers and have not experienced problems before. Blackout may also be referred to as a syncope or fainting.
Divers and swimmers who black out or grey out underwater during a dive will usually drown unless rescued and resuscitated within a short time. Freediving blackout has a high fatality rate, and mostly involves males younger than 40 years, but is generally avoidable. Risk cannot be quantified, but is clearly increased by any level of hyperventilation.Freediving blackout can occur on any dive profile: at constant depth, on an ascent from depth, or at the surface following ascent from depth and may be described by a number of terms depending on the dive profile and depth at which consciousness is lost. Blackout during a shallow dive differs from blackout during ascent from a deep dive in that deep water blackout is precipitated by depressurisation on ascent from depth while shallow water blackout is a consequence of hypocapnia following hyperventilation.
One: Factory New August 2020 Manufacture Date (See Box Label) Sig Sauer MCX Rattler .300BLK Pistol & Discreet Carry Package+ Mags+ carry bag! This is a steal!
The Rattler is one of the best PDWs currently on the market, with a tiny footprint and rifle cartridge power, the Sig Rattler 300 BLK is...
This is a used .300 blackout upper by Ruger. It came off their .300 blackout AR Pistol. It does not come with a BCG or charging handle. However, it does have a KAW Valley Compensator and a Magpul finger stop installed. It has a M-lok rail and I have only put about 80-90 total through it.