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phosphate
In chemistry, a phosphate is an anion, salt, functional group or ester derived from a phosphoric acid. It most commonly means orthophosphate, a derivative of orthophosphoric acid H3PO4.
The phosphate or orthophosphate ion [PO4]3− is derived from phosphoric acid by the removal of three protons H+. Removal of one or two protons gives the dihydrogen phosphate ion [H2PO4]− and the hydrogen phosphate ion [HPO4]2− ion, respectively. These names are also used for salts of those anions, such as ammonium dihydrogen phosphate and trisodium phosphate.
In organic chemistry, phosphate or orthophosphate is an organophosphate, an ester of orthophosphoric acid of the form PO4RR′R″ where one or more hydrogen atoms are replaced by organic groups. An example is trimethyl phosphate, (CH3)3PO4. The term also refers to the trivalent functional group OP(O-)3 in such esters.
Orthophosphates are especially important among the various phosphates because of their key roles in biochemistry, biogeochemistry, and ecology, and their economic importance for agriculture and industry. The addition and removal of phosphate groups (phosphorylation and dephosphorylation) are key steps in cell metabolism.
Orthophosphates can condense to form pyrophosphates.
Microbest 5.56 BCG C158 MPI Chrome w/ Phosphate Extractor
This would make a fantastic spare or replacement BCG for your favorite rifle. Great price on these.
Chrome finish is great for running a dirty gun (suppressed or otherwise) as it's a much easier surface to clean, and Microbest is one of...
I have a bad habit of buying BCGs every time I see them, and need to thin the herd.
All are unfired with MPI marked bolts.
Aero Precision, phosphate finish, chrome lined carrier, 9310 steel bolt, $110
ToolCraft, nitride finish, C158 steel bolt, $70 each
Unmarked (but I think it's Aero...
Unmarked chrome lined phosphate bcg, head spacing was checked but otherwise unfired. The cam pin was dimpled and then cold blued. $75 shipped. PayPal or zelle preferred.
For Sale/Trade:
Lightly used, maybe 300 rounds through it. Well maintained. Has Sig Romeo 5 on it, and KAK Flash Can. Sling and one loaded 30 round PMag will be included for a package deal.
Trade interests include:
Glock 17, 19, 43xMOS
300AAC Pistol
Might be interested in some other items...
I have two brand new 556 bolt carrier groups for sale.
They are manufactured by Microbest and were both purchased from PK Firearms about 6 months apart. Both are brand new, never fired, comes with packaging. PK says they will not have any more of these in stock for the foreseeable future...
New in packaging, never got around to using. Looking to get 100$ i paid 110 including shipping i believe. Must meet in salem and no trades or shipping. Thanks for looking
Up for sale/trade is a well loved (used) PSA .223/5.56 phosphate BCG. I’m not sure what the exact round count is but it’s seen at least a case of 5.56. It’s been disassembled and cleaned but as anyone knows it’s an AR BCG so there will always be something left somewhere.
Trade interests include...
Pretty good deal on the 11.5" with BCG. Guys selling similar on our forums for several hundred over what you can buy it for direct.
https://palmettostatearmory.com/ar-15/barreled-upper-assemblies.html?p=2...
So a group build of milspec AR 15 semi-auto rifles went belly up during parts purchases. I have 4 brand new milspec, semi-auto BCG units for sale. $120 each.
Mfg web site description as follows:
“AR 5.56X45mm (223, 300 BLACKOUT) SEMI AUTO BOLT ASSEMBLY MIL-SPEC 8620 CARRIER CARPENTER 158 BOLT...
Brand new, never used. US made part counts towards 922 compliance. This is the 14-1 LH thread, common on the 7.62x39 AK's. Make sure you have the correct threads.
This is an outstanding flash hider and linear comp. Directs the muzzle blast downrange and not to your buddies on either side...
Palmetto State Armory 10.5” Phosphate 5.56 1/7 Barreled Upper up for grabs. Barrel is marked “5.56 NATO 1/7”.
Does not include BCG and CH.
$220 local pick up in Hillsboro/Beaverton
PM with phone number for fastest response
Thank you
REMOVING ALL POSTS DUE MEMBERS, YOU KNOW WHO YOU ARE, BUYING ITEMS FROM ME AND RESELLING THEM FOR A HIGHER PRICE TO GOUGE OTHER MEMBERS. THATS BULLSH$T. HOPE CARMA BITES YOU IN THE A$$