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block 2

A block of the periodic table is a set of elements unified by the orbitals their valence electrons or vacancies lie in. The term appears to have been first used by Charles Janet. Each block is named after its characteristic orbital: s-block, p-block, d-block, and f-block.
The block names (s, p, d, and f) are derived from the spectroscopic notation for the value of an electron's azimuthal quantum number: sharp (0), principal (1), diffuse (2), or fundamental (3). Succeeding notations proceed in alphabetical order, as g, h, etc.

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Recent contents
  1. Del-Tonic

    M4 Block II Clone Upper

      1. For Sale
      2. For Trade
    • $1250
    • Bend
    • Oregon
    moved thread
  2. Saffir

    Geissele Super Precision 30mm Scope Mount (black) for your DDC/TAN/FDE

      1. For Trade
    • Portland
    • Oregon
    Looking to trade my like new, perfect condition Black Geissele Super Precision for your DDC Geissele Super Precision Mount or Tan Badger Ordnance Condition 1 Mount - must be 30mm. Here’s the link to mine: https://geissele.com/optics/magnified-optic-mounts.html Don’t care about with or without...
  3. AWNING

    Colt SOCOM barrel

      1. For Sale
      2. For Trade
    • $350
    • Oregon City
    • Oregon
    Brand new in bag Colt SOCOM 14.5. Never drilled for FSP. 350 obo always open to hear trade offers.
  4. Mark_Dorman

    Criterion Barrels - opinions on Core vs Hybrid?

    Hey All, was wondering if anyone had experience with two of the Criterion Barrel profiles. I'm pretty much settled on using a Criterion Barrel for my next 223/5.56 Upper build, but am stuck between the Core Series and Hybrid 14.5 inch. Reviews on the Core series seem to be amazing but I find...
  5. A

    14.5" Pin & Weld, Daniel Defense/Brownells M4a1 or Colt/DD Block 2 upper

      1. Want to Buy
    • Bellevue
    • Washington
    looking for a Brownell's/Daniel Defense m4a1 upper - Pin and welded or a colt/DD block 2 upper build -somewhere between 700-800 pending the weld job and muzzle device. No BCG/CH. I can trade for an unfired factory Colt M4a1 factory SOCOM upper 14.5 P&W, (comes with factory KAC RAS) 8-900+ if...
  6. E

    Colt cqbr Block 2

      1. For Sale
      2. For Trade
    • $2100
    • Snohomish
    • Washington
    Pristine condition Colt m4carbine factory lower Colt Tano buffer tube Geissele sss-e trigger Sba4 brace Colt cage code upper Colt bolt/bcg Colt 10.3” govt profile barrel Geissele war comp fh DD RIS 2 Front/Rear CQD sling mounts Blue force gear padded sling with HK hooks Trade for KAC Uppers or...
  7. Saffir

    Colt Cage Code 14.5” SOCOM Barreled Complete Upper, Geissele SMR MK8 13” Handguard and Geissele Super Gas Block

      1. For Sale
    • $850
    • Portland
    • Oregon
    SOLD Like the title says, Colt Cage Code 13629 complete upper receiver including “C” stamped carrier and “MPC” marked bolt. Barrel is also Colt Cage Code 13629, 14.5” 5.56 NATO 1/7 Twist SOCOM. Super low round count (in the 150rd region) so the barrel is in excellent shape. Geissele rail of...
  8. SIG34

    Rare Colt M4 anodized receiver set

      1. For Sale
    • $900
    • Monroe
    • Washington
    Colt M4 FDE anodized receiver set - Few hundred rounds fired * in good condition! - Was a Le6920 that was going to be turned into a M4a1 block 2 but got a property marked receiver.. - Keyhole C marked upper receiver! - LE serial number lower (Sorry no shipping, local sale only)
  9. Khalsa

    Sopmod Block 2 FrontSightPost RIS2 rail complete BCM rifle assembled by BCM. Features 16” Socom profile barrel, Daniel Defense RIS2 FSP. Bcm lower

      1. For Sale
    • $2750
    • Eugene
    • Oregon
    For reply text 5414809797 Complete “Sopmod Block 2” clone RIS2 FsP. Built by BCM. Near mint condition. Fired less than 500 rounds. This is a very nice rifle and has been utilized by USASOC for over a decade. Comes with SUREFIRE WARCOMP CLOSED TINE, B5 Sopmod enhanced buttstock. Knights...
  10. E

    Colt Sopmod Block 2 upper

      1. For Sale
    • $1600
    • Snohomish
    • Washington
    100% clone correct, new/unfired. All Colt, Colt Socom profile barrel, Colt bcg, KAC correct buis, Surefire 4 prong pinned/welded
  11. P

    Colt FSP 10.3 Block 2 upper

      1. For Sale
    • $1200
    • Portland
    • Oregon
    Hello, Selling a brand new Colt 10.3 Cqbr FSP build. -Colt receiver -Colt factory 10.3 barrel -Colt Gas system -Colt FSP -Daniel Defense Ris II handguard in fde. Everything is brand new and unfired. no trades
  12. C

    High End AR Uppers

      1. Want to Trade For
    • Seattle
    • Washington
    Bit of a timed request here, but I am looking for either a 13.7" or 14.5" Gucci AR upper. Brand doesn't matter, as long as it's one of the top tier brands :p Only looking to trade, my trades can be found here and here two06 - 9two9 - fivefour80
  13. Mark

    Colt M4A1 Block 2 upper (mostly clone correct)

      1. For Sale
    • $1000
    • Corvallis
    • Oregon
    Not very sure I want to sell, but trying to move away from cloning and go towards a more affordable/modern build... Although I'm open to a URGI upper trade.... Colt upper Colt 14.5" barrel Daniel Defense RIS II 12.5" in FDE Surefire 3 prong flash hider (pinned/welded) MK12 Gas block ? Teardrop...
  14. E

    Sopmod Block 2

      1. For Sale
      2. For Trade
    • $2900
    • Bothell
    • Washington
    Upper is new/unfired and 100% Clone correct, lower is the opposite of that! Upper, military surplus Colt Keyhole/C stamped upper receiver F Stamped bcg Colt 14.5 Socom profile barrel DD mk12 gas block Surefire 4 prong flashider(I had pinned/welded) DD RIS 2 KAC 600m rear buis KAC 99051 Taupe...
  15. E

    Block 2 Upper

      1. For Sale
      2. For Trade
    • $2100
    • Snohomish
    • Washington
    Purchased built, military surplus upper, all parts are new except buis. Colt C stamped/keyhole upper receiver F stamped bcg DD mk12 gas block Colt socom profile 14.5” barrel Surefire 4 prong flash hider (I had pinned/welded) PRI Gasbuster Charging handle KAC Rear Buis KAC 99051 Taupe front...
  16. SIG34

    Knights Taupe front sight

      1. For Sale
    • $190
    • Monroe
    • Washington
    Knights armament Taupe front sight (Hard to get in FDE) most now are gray tone perfect for Block 2 project
  17. SIG34

    Elcan SpecterDR 1-4 5.56 FDE (NIB)

      1. For Sale
    • $1600
    • Monroe
    • Washington
    Elcan SpecterDR ( brand new still sealed box ) - 1x - 4x zoom - kill flash - scope covers - QD mount Military proven & perfect for block 2 series of rifles !
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