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iron
Iron () is a chemical element with symbol Fe (from Latin: ferrum) and atomic number 26. It is a metal that belongs to the first transition series and group 8 of the periodic table. It is by mass the most common element on Earth, right in front of oxygen (32.1% and 30.1%, respectively), forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust.
In its metallic state, iron is rare in the Earth's crust, limited mainly to deposition by meteorites. Iron ores, by contrast, are among the most abundant in the Earth's crust, although extracting usable metal from them requires kilns or furnaces capable of reaching 1,500 °C (2,730 °F) or higher, about 500 °C (900 °F) higher than that required to smelt copper. Humans started to master that process in Eurasia by about 2000 BCE, and the use of iron tools and weapons began to displace copper alloys, in some regions, only around 1200 BCE. That event is considered the transition from the Bronze Age to the Iron Age. In the modern world, iron alloys, such as steel, inox, cast iron and special steels are by far the most common industrial metals, because of their mechanical properties and low cost.
Pristine and smooth pure iron surfaces are mirror-like silvery-gray. However, iron reacts readily with oxygen and water to give brown to black hydrated iron oxides, commonly known as rust. Unlike the oxides of some other metals, that form passivating layers, rust occupies more volume than the metal and thus flakes off, exposing fresh surfaces for corrosion.
The body of an adult human contains about 4 grams (0.005% body weight) of iron, mostly in hemoglobin and myoglobin. These two proteins play essential roles in vertebrate metabolism, respectively oxygen transport by blood and oxygen storage in muscles. To maintain the necessary levels, human iron metabolism requires a minimum of iron in the diet. Iron is also the metal at the active site of many important redox enzymes dealing with cellular respiration and oxidation and reduction in plants and animals.Chemically, the most common oxidation states of iron are iron(II) and iron(III). Iron shares many properties of other transition metals, including the other group 8 elements, ruthenium and osmium. Iron forms compounds in a wide range of oxidation states, −2 to +7. Iron also forms many coordination compounds; some of them, such as ferrocene, ferrioxalate, and Prussian blue, have substantial industrial, medical, or research applications.
U.S. Army Standard-Issue Backup Sight For M4/M16A4
This sight is in incredible condition, it comes with the forward controls retro clamp kit pre-installed.
I take PayPal friends and family
Shipping ok, free shipping
No trades please
No f2f please
Blurb from brownells:
Current U.S. Army...
NIB Griffin M2 iron sights. These sights have a modular base and can run at the standard 12 o'clock position or at 45 degrees by swapping the base plates. This kit includes the standard 12 o'clock plates.
$100 for the set, I accept cash and PayPal and can ship USPS if needed...
Recently I was given a very nice SS LP grill that needed a little cleaning and new burners to bring back to life.
Well, the former owner also had a flat griddle and an a pan, both cast iron, that originally came with it and never used, still in the wrapping.
OK, so I laid the flat grill out on...
Elzetta ZFH1500
Tactical flashlight holder
Brand new
Would fit on my short barrel
Packaging and paperwork included.
$25
Add $8 for usps priority 1-3 day shipping.
PayPal or cashapp.
New and comes with retrofit kit. Retrofit kit info
Kit already installed on sight.
From matechsolutions page :
Back-Up Iron Sight
Matech Back Up Iron Sights. BUIS. Rear Iron Sights. Solid, robust, and as accurate as your eyes and skill will allow. Elevation markings from 200 to 600 Meters...
Question:
Will the Badger Ordnance Contition One J-mount w/ an Aimpoint T2 cowitness with 45 degree offset iron sights?
I don’t really want to run irons but my department policy requires us to have cowitnessed irons through our optic. My nightforce 1-4 won’t allow for that but I’m curious if...
Hi NWF Crew,
I thought I'd share this with you guys. It's an old picture of one of my racks set up forinsurance documentation Like most of us here, I like shooting the old iron but it's gotten expensive as of late, and I really haven't been shooting much in quite a while. But I haven't stopped...
I have an Anderson lower with CMMG internals, Bear Creek Arsenal 5.56 side charging upper. Gun shoots great. Never had a malfunction. Comes with a case, sling, iron sights, 2 30 RD mags and 60 rounds brass 556. Perfect home defense setup.
I'm looking to trade for a Hunting rifle. Let me know...
I have 2 sets of Sig Sauer Contrast sights for sale, taken off my 2018 production P229 and P227 with #6 front and #8 rear sight heights and a square rear notch. Asking $30 OBO for each set, or willing to trade for P229 .357sig magazine. Thanks!