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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.
Original owner, used once Colt EPR complete upper with 14.5" chrome lined barrel, Centurion Arms CMR handguard, Colt upper receiver and Colt BCG/charging handle. I bought a batch of these a few months ago but want to unload a couple before moving. This one was zeroed and tested once (20-30...
AR15 Complete Pistol Upper 11" 5.56
Ballistic Advantage Complete Upper (By Aero Precision)
Pencil profile barrel, R One MLOK Handguard, Rail Grips, Odin Muzzle Device.
Less than 200 rounds through it. 2 range trips.
$500
Reduced: $350 with no BCG.
$450 w/ New BCG
Pickup in Gresham or...
This is a BRN-180S GEN-2 complete upper receiver it has a 223 Wylde barrel, it also includes:
*SB tactical folding buffer tube adaptor
*buffer tube picatinny adaptor
(lower receiver, buffer tube and brace not included)
I fired two 30 round mags through without issue and then moved on to my next...
New, unfired Colt HBPW upper up for grabs. Has a 14.5” SOCOM profile barrel that is factory pinned/welded for 16” OAL. Comes with Colt double heat shield handguards. No BCG or CH but can include a Colt BCG for the buyer for additional $.
$500 local pick up in Hillsboro/Beaverton/Portland...
Im selling my new unfired BCM upper I got a few months ago and never used I installed a Centurion arms m-lok handguard. It comes with a standard charging handle and a mil spec BCG along with a NOS Matech rear sight. This has the socom heavy barrel profile and with the centurion rail it is free...
Up for sale/trade is this brand new 16” Daniel Defense DDM4v11 complete upper chambered in 5.56. Haven’t even sent one down the pipe and pretty sure I still have the box. Cleaning out the safe and she has sat for too long. I’m open to trades for equal or maybe even lesser value depending on the...
Complete upper build from AR-15discounts. Also selling a Sig MSR Red Dot for $80 but if you want to buy it with this I'll take $20 off the red dot as a package. This has had 1 mag through it and everything functions well. Just going another route and don't need this sitting around.
-NBS AR-15...
$900
MAXIM DEFENSE PDW COMPLETE UPPER. COMPATIBLE WITH ANY MIL-SPEC LOWER
ABOUT 200RDS FIRED
RADIAN CHARGING HANDLE
ORIGINAL BOX
PREFER TO MEET AT MAZAMA IN EUGENE.
Aero Precision M4E1 16" 5.56 M4 Complete Upper Receiver w/ ATLAS S-ONE Handguard Black
Less than a thousand rounds down range. Functions flawlessly.
AR15 Gen 2 Assembled Upper Receiver
ATLAS S-ONE 15" Handguard M-lok with front and rear picatinny rail
16" 5.56 CMV Barrel with 1/7 twist and...
Decided to go another route so I’m selling my upper.
Aero Precision M4E1 upper
Geissele MK8 13.5 mlok rail
Milspec BCG
Radian raptor charging handle
14.5” Rosco barrel
Dead air flash hider/ suppressor mount
The upper was put together buy Curts custom shooters in Milwaukie.
If you...
10.5 inch Barrel with VG6 Epsilon 9mm Muzzle Device (total length 12.25 inches)
7.25 inch Yankee Hill Machine KeyMod Handguard with Ergo Wedgelok Rail Covers
Fail Zero Bolt Carrier Group
Mil-spec Charging Handle
Selling a complete PSA nitride uppper with a Aero Precision BCG and MI quad rail in tan/FDE with magpul accessories willing to trade also for a 9mm pistol depending on the quality and brand of the pistol plus cash on my end also good red dots or LPVO thank you.
Selling a lightly used complete upper it’s a PSA nitride upper with a Aero precision BCG with a standard mil spec CH comes with the Midwest industries quad rail in tan with hand guard covers and magpul accessories, if you have any questions please let me know open to trade also let me know what...
Complete upper with all OEM parts: barrel, BCG, charging handle. The upper is the exact same as: 16" Carbine Tactical Evo Upper
Condition and package:
Essentially new condition, total 200-300 rounds through it (shot brass and steel cased), no problems at all. Comes with all original parts and I...
Still Available 7/22
Price Lowered to $500 OBO. Will ship for free if I receive full price in advance.
Please PM any trade offers
Open to trades for the following pistols (also have lpvo ($300 trade value) I can include depending on pistol value) ranked in order of desirability:
- .45 ACP...
Selling this complete upper in 300 AAC Blackout. Only put 80rds though it, runs great, no malfunctions.
Specs;
-TNW billet upper receiver, made in Vernonia OR.
-Timber creek billet dust cover and ambi charging handle
-Areo Precision BCG
-Ballistic advantage Hanson professional 9”
barrel w/...
Take off Colt 6920 16” Barreled Upper for sale. Comes as pictured but I will include Colt double heat shield handguards. Unsure of round count of but it doesn’t look like it’s been used much at all. Does not include charging handle or BCG.
$350 local sale in Hillsboro
Not interested in any...