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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.
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
I was gonna buy a little tools for these slides, but was hoping someone here would like to make a few bucks and earn their money back for their own tool. If you have an extra rear sight or front sight I can buy that off you as well.
I recently purchased a Glock G45 and have purchased some taller iron sights in preparation for installing a Trijicon SRO reflex sight. I can easily install the reflex sight myself but do not have the tools or experience to install the iron sights. A also don't want to screw up the slide...
Brand new upper from Firearms unknown in SoCal. Retails for about $900. Lower is an Anderson with magpul parts. Brand new, never used. Fixed iron sights added. Comes with 1 brand new PMAG.
https://www.firearmsunknown.com/builds-parts/ar-parts/complete-uppers/
Location: Wood Village, OR / Vancouver, WA / Washougal, WA
Price: $40, no trades
Parting out my 300 blk build. About a year old. Some inexpensive BUIS just to have as back up
Hey everyone iron monkey brought in 50k worth of aero lowers and uppers all cheaper than the big names in the area. Best part no lines and great dudes running it! They have more they were putting out while I was there
Selling my gently used Leupold Delta Point Pro #179585, 2.5 MOA with installed Leupold Picatinny mount and Leupold #120058 rear sight combo. Leupold protective cover included. Can be installed on your favorite handgun, shotgun or AR platform.
This stuff is in excellent condition. Having been...
Up for sale is a set of Midwest Industries Combat Rifle Offset Sights (https://midwestindustriesinc.com/combat-rifle-offset-sight-set/)
These have what I would consider normal wear-and-tear having been mounted on a few different rifles over the last two years, but still work perfectly and lock...
Selling a Savage B22G bolt action rifle. Has factory wood stock with rubber buttpad and iron sights. Adjustable accutrigger, 21" barrel. Beautiful rifle, chambered in 22lr, bought for my grandson, but his Mom says no, he is too young, so I will get him something else later. 10 round rotary mag...
Hola all,
I have a set of BUIS that I no longer need (FDE Troy 45 Degree Offset Folding Front & Dioptic Rear Iron Sights). I haven't used them.
$140 (retail for about $200-ish)
LaRue / Troy Dioptic diamond rear sight
Aero HK style front sight
Both are metal, picatinny rail mount
$125 cash or trade for
rifle slings
Red dot
I’ll ship , you cover the postage .
Located in Vancouver
I’ve got a Hornady lock n load iron works press with auto primer for sell. This press I don’t think has ever been used, if so definitely not much but it looks like it hasn’t been. I’m a truck driver and go to Portland a lot so I could meet here or there or somewhere in between since shipping...