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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.
Selling a Troy front BUIS and a YHM rear sight. Both in very good condition. Will sell separately for $80 each, or together for $150.
Will consider shipping for an extra $20. Cash or Venmo. FTF in SE PDX or close-in Portland.
A few years ago, I bought a Winchester Model 70 Featherweight in 7mm Mauser. These came from the factory with or without iron sights. The iron sight models are less common. I bought this one specifically because it had this feature. It took me quite a while to get the sights regulated to the...
Up for sale, Southwest Washington, Vancouver area, Clark county area.
Knights Armament KAC 600 meter back up iron sight. For AR-15 type rifles.
Brand new, opened up the package to take pictures, never been used.
Selling for $100 cash.
Can ship. +$5. PayPal.
Send conversation, Private...
Hello! Wife says I need to get rid of some things I don't use, so here's what I got! Most things priced to sell, open to trades but looking for specific things.
Trades
x3 Blue force gear vickers sling PADDED
x2 surplus, preferably new canteen w/pouch
x1 earth tone color Osprey(or equivalent)...
Magpul MBUS Gen2 front sight in black, and a S&W M&P15 rear sight that was spray painted years ago.
$20 each or $30 for both. Prices are shipped Continental U.S. only.
Message me here or TEXT me at 74O-625-3301
I accept PayPal, Zelle, Venmo, Cashapp only
Thanks for lookin'!
I am moving out of state and unfortunately cannot take my AR-15 with me. Gun is in very good condition (always cleaned regularly and kept in gun cabinet) and pretty accurate straight out of the box.
Total round count is well under 1k. Gun comes with original manual, safety lock and possibly with...
I have a set of good condition Daniel Defense fixed iron sights that I would be willing to trade for a set of new Gen 3 Magpul MBUS, either black, or FDE.
CZ 452 Special Military Training Rifle 22LR
bolt action; fixed front sight; adjustable rear sight; Barrel length 23.5 inch.
one 5-rd mag; two 10-rd mag
leather sling (1 inch width, medium length, light brown)
a case
asking $370
Buyer finds FFL and pays all the fees.
Local to Portland...
EDIT: also a 100% free to view link below
This just got added to Prime as far as I can tell, was pay-to-view other places before. I know Prime is still a pay service but it’s much more common than others I think and not hard to get free access to (I get it via a family member in fact and don’t...
***Sales Pending Funds***
Set of BUIS from Bobro. Still the lowest profile on the market. Very well built.
Will ship to any member that has at least 10 positive feedback rating. Buyer pays shipping.
Trade interests:
Keymo Muzzle Devices (5/8x24) for 30 cal (flash hider or brake)
Quality...
Hey I'm looking to get rid of these irons. Had them on a budget gun that I sold. Got these from another member here and passing on the savings. He rattle canned them but they look to be lightly used.
The front sight is the Troy flip up with the noveske marking.
The rear sight is the GG&G MAD...
Working on a budget build and need some sights?! Look no further!
I have a set of ncStar flip up metal iron sights and a AT3 Tactical red dot with 11 brightness settings on a quick detach mount. These will fit a 1913 rail. Selling them as a set.
I’m willing to ship, buyer pays shipping.
Diamondhead USA Front and Rear Combat Iron Sights - Integrated Sighting System
Used. Has some light finish scratches, no gouges or dents. They work great Im just parting out stuff I dont shoot anymore.
$80 Cash F2F SE PDX or possibly NE
$85 shipped venmo, cashapp, zelle, money order
$88...
I'm 73 and my vision is getting foggy
haven't been able to shoot irons sights for 20 years
I get my first eye done tomorrow - just lens replacement paid for by Medicare
I told the doc I wanted to be able to shoot iron sight rifle at 100 yrds again
second eye next Tue - will let you know