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complete upper
In mathematics, the least-upper-bound property (sometimes the completeness or supremum property) is a fundamental property of the real numbers and certain other ordered sets. A set X has the least-upper-bound property if and only if every non-empty subset of X with an upper bound has a least upper bound (supremum) in X.
The least-upper-bound property is one form of the completeness axiom for the real numbers, and is sometimes referred to as Dedekind completeness. It can be used to prove many of the fundamental results of real analysis, such as the intermediate value theorem, the Bolzano–Weierstrass theorem, the extreme value theorem, and the Heine–Borel theorem. It is usually taken as an axiom in synthetic constructions of the real numbers (see least upper bound axiom), and it is also intimately related to the construction of the real numbers using Dedekind cuts.
In order theory, this property can be generalized to a notion of completeness for any partially ordered set. A linearly ordered set that is dense and has the least upper bound property is called a linear continuum.
Complete Upper Assembly w/ 16" CHF Barrell - only has 150 rounds through it
Will accept combo trade and cash for 5.56. Will negotiate.
Ive put about 1000 dollars into it. Full component list:
BCM BCG
Aero Upper
Radians Raptor Charging Handle
YHM 12.8" quad rail
BCM gunfighter muzzlebrake...
SPF
I have a 10.5in 223/556 complete upper. Aero precision upper with aero parts kit. 10.5in barrel is a ballistic advantage, Bowden tactical 10in mlok rail, arson machine co muzzle device, white label armory BCG. The barrel its self has 20 rounds through it. The bcg is still new and hasn't...
Due to lack of choices, I decided to order the 20" AR-15 6mm ARC complete upper (see here) since I'm eager to experiment with 6mm ARC. I don't see the choices getting any better anytime soon with what's going on in DC, so I settled and am hoping for the best.
Anyone have experience with this or...
NIB DDM4V11, never fired only attached to a lower a few times and larped hard around the house. Be part of dick mod history with this v11 rail.
Looking to keep the Daniel Defense BCG but will include for additional $175. Not looking to sell BCG separately.
OnlyFanz
Possible trade for...
CUSTOME CERAKOTE, 10" BARELL, KEYLOK HANDGUARD, NICKLE BORON BCG, STRIKE INDUSTRIES CHARGING HANDLE, NEW NEVER FIRED, READY TO MOUNT TO YOUR AR LOWER, 500.00 SOME TRADES
New complete upper receiver from Daniel Defense as seen here https://www.brownells.com/rifle-parts/receiver-parts/receivers/upper-receivers/ddm4v11-16-5-56mm-nato-upper-receiver-black-prod105008.aspx
Never used, in box.
Price drop but BCG has been sold. $850 $500
PSA 7.5” Marauder MOE complete upper. Chambered in 5.56. $300 OBO. 30 rounds shot through it. Perfect condition just trying to finance some other stuff.
Adam 530-306-7523. In Milwaukie...
Excellent condition Bushmaster 20” HBAR A3 Complete upper. Barrel marked ( B MP 5.56 NATO 1/9 HBAR). Semi Auto cut BCG and standard CH included. Cerro Forge marked A3 upper receiver, FSB has bayo lug, and barrel has standard A2 Flash Hider.
$400 local pick up in Hillsboro/Beaverton
PM with...
For sale is a 14.5 pinned and welded to 16" overall complete upper ready to drop onto any lower receiver. Comes with a ballistic advantage CMV barrel with a 5.56 chambering, mid length gas system, and 1:7 twist. A2 pinned front sight with a blitzkrieg components chevron post and a fixed rear...
AR15 New 5.56 Complete Uppers-Aero Precision 18"; Palmetto State Armory 16" & 14.7” Pinned
New old stock; safe queens. Functionally perfect. Accessories may have been added and removed, and uppers moved around safe, so not cosmetically perfect. None have been live fired, but all the...
For sale is a 10.5” 5.56 PSA upper. Included is the upper as pictured with detachable carry handle. No BCG or CH is included.
This upper is a catch and a release (bought on another forum) so I cannot speak to its performance, though it appears to have a low round count. The carry handle is in...
Used Colt 6920 16” Barreled Upper looking for a new home. ~1500rds down the barrel. Comes with factory heat shield. NO BCG and CH. Magpul BUIS is NOT included.
$400 local pick up in Hillsboro
Not interested in any trades
PM with phone number for fastest communication
11.5" 5.56 HBAR 1/9 A3 chrome lined uppers. Pretty good suspicion they are early Bushmaster(before they got bought out). Complete with BCG/CH. Can't give ya much more info than that as far as mileage/materials go, how LE trade ins go sometimes unfortunately.
3 available (2 with carry handles, 1...
Brand New un-used and United-fired Sig Sauer 516 Gen2 14.5" Barrel Upper Receiver Assembly, Semi-Auto.
The SIG SAUER advanced short-stroke pushrod system reduces carbon fouling, excessive heat and unburned powder in the action, ensuring reliability and function that is unmatched. A standard...
For sale is a 8.5" 5.56 1/7 twist Nitrided complete upper with BCG and charging handle. less than 50 rounds down range, shoots perfectly. Included Midwest Industries flash can cuts down on concussion and kills the flash. Including a BCM KAG angled grip. AT3 Tactical Billet upper with 9" Mlok...
i have an Aero Precision 14.5" 5.56 upper with Type R handguard. The upper has less then 150rds and is in near perfect condition.
I only want to trade upper, I'm keeping my bcg/CH and accessories.
Wife really wants the 10.5" Aero Precision upper with the M-lock or the picatinny handgaurd. If...
Del-Ton Dissipator Complete Upper up for grabs. 16” 1/9 HBAR with rifle gas system. ~300rds down the barrel without any issues using a H buffer.
$300 for the complete upper
$350 for the complete upper with Radian LT Raptor CH
Cash pick up
Local to Beaverton/Hillsboro
Ar-15 5.56 prefer new, or very lightly used. With or without bcg/ch.
Prefer fde but will buy black if needed.
Doesn't have to be aero but same quality or greater i do have a budget which is around the price for a new Aero complete upper.
Price: $450
Condition and package:
Close to new condition, total 300-400 rounds through it (tested with brass and steel cased), no problems at all.
Comes with all original parts and I can throw in a bag and the Lancer mag that came with it.
For the Samson Manufacturing Anti-Rotation handguard...