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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.
I have 1,000 pieces of once fired range brass, mixed headstamps. It has been de-primed and washed. I also sorted out all the short stuff (a lot of it!) so this brass is minimum length or longer. No 223 conversion all 300 BO headstamps
$170.00 shipped for the lot, if you want a smaller batch I...
Bear Creek Sporter 300 blk 10.5in upper. No forward assist or dust cover. Is scratched on left side. Functions perfectly. Only 35 rounds through it but had no issues. Decided to go 5.56 instead. Will sell complete or without BCG and charging handle.
I also have 465 rounds of new brass 147gr...
I have 465rds of new brass .300 blk FMJ 147gr.
American Quality Ammunition
I want to sell all of it together for $450
I also have a Bear Creek 10.5in sporter 300blk upper with BCG and charging handle for $200
Without BCG and charging handle $160
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.