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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.
SOLD
For sale is an Aero Precision M4E1 Enhanced upper with a 15" M-lok rail, and a 416R 1/8 223 Wylde 20" Fluted DMR pofile Rifle Length gas Premium series Ballistic Advantage Barrel. Has a 1 MOA guarantee form the Factory and has been bedded for accuracy. Installed is the VG6 Precision...
SOLD
For sale is a complete Aero Precision upper with a 16", 416R Stainless, Fluted, 223 Wylde, 1/8 twist, hand lapped, Intermediate Gas, Stretch Precision Stretch 16 competition barrel. The upper is a M4E1 upper with a slim Aero 12.5" Atlas R-1 M-lock rail. I have achieved 3/4 inch groups with...
Hi I have a as new AERo 10.5 in complete upper. This is a 10.5 in nitrated Stanless Steel 1/10 twist .308 chamber. Barrel. 9in AERO keymod rail. Comes with nitrated bolt group and chargeing handle. Plus dragon skins rail covers. Carbine length gas system. Less than 100rds fired. Very fun! $450...
Hi I have a complete AR10 .308 upper. This is a 16in ultra light pencil profile nitrated Balistic advantage mid-length has system barrel with pined low profile gas block. Comes on a Daytona tactical DPMS pattern upper. Slick side. Has a nitrated bolt group and chargeing handle. MLOK 15in light...
Hi I have a excellent condtion 16 in nitrated Blastic Advantage .300 blackout complete upper. 16in nitrated barrel with carbine gas system. Comes with a Troy 13.5in MRF rail with Magpull rail covers. Tool craft bolt group and chargeing handle. $280 shipped PayPal gift or fee or can do a face to...
SOLD
For sale is a light weight 14.5 pinned and welded Faxon Firearms Match Grade .223 Wylde, 1/8 twist, mid length gas, 5R rifling, 416r stainless, nitride treated, complete upper. The barrel is the perfect combination of a being thicker in the rear for more rigidity and slimmer out front...
PSA 10.5” 5.56 Complete upper with bolt and charging handle $200. I decided to go a different route on a build and am looking to unload this upper. Runs well has about 200 rounds through it. Available in Tigard.
Like new maybe 200 to 300 rounds through it I got a custom slide so I don’t need this one asking 350 this is a complete slide with all parts and barrel
I have a used AR15 upper with 16” barrel and free float Keymod handgaurd. Upper has about 100 rounds through it without issue. Bought it at a show a while back I do not know what brand it is.
$275 local pickup in Bend/ LaPine
Lower is not for sale.
NO LONGER AVAILABLE
For sale is a complete Aero Precision upper with a 16", 416R Stainless, Fluted, 223 Wylde, 1/8 twist, hand lapped, Intermediate Gas, Stretch Precision Stretch 16 competition barrel. The upper is a M4E1 enhanced upper and a 15" Enhanced m-lok handguard. BCG and Charging...
Selling a NIB Aero Precision M4E1 factory built upper in 5.56 with 16 inch 1 in 7 twist barrel and 12 inch M-Lok handguard (all black). Brand new in the box, never fired. No BCG or CH. $350. Located near Olympia.
Originally started out as a MK18 upper. The DD upper receiver was swapped out didn't like the Daniel Defense laser etching on the side. Quad rail was taken off and swapped with a beautiful Desert Geissele Mk8 rail. Original Daniel Defense 10.3 barrel with proper gas port size. Geissele super gas...
SOLD
For sale is a complete Ballistic Advantage upper with BCG and charging handle. Parts include, 16" mid-length Hanson Premium series 223 Wylde 1/8 twist 416R barrel with pinned low profile gas block and VG6 Delta compensator (barrel is guaranteed 1 MOA at 100 yards with match grade ammo)...
I'm selling an Aero Precision Complete Upper in .300 Blackout, 10" barrel with their 9" gen 1 enhanced handguard. It's this, except the handguard is GEN 1 so it doesn't have the gen 2 features listed there.
It was unwrapped, but never used, and I'll include the barrel nut wrench that came with...