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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 SOLD. (385) 355-5010 mobile. $235 or your offer
PSA 5.56/.223 Complete (truly) Upper
• BCG included
• Charging handle included
• Brand New
• Reliable seller
From Primary Arms
Troy Industries 14.5" 5.56 1:7 Carbine Length Complete Upper - 11" M-LOK Rail and Flip Up BattleSights - Black SUPG-ML1-14BT-00
The Troy Industries 14.5" 5.56 NATO Complete Upper is a high quality, MIL-SPEC assembly. Complete with bolt carrier group, charging handle, and...
SOLD SOLD SOLD Please make an Offer. (385) 355-5010. Never fired 5.56 NATO Complete Upper by Anderson $225. Save some money on 300 black out ammo. Throw this upper on your lower, set in your BCG and charger, use your magazines and you’re ready to roll. Just got two guns in one. 450 rounds of...
I’m looking to sell my Noveske SPR complete upper. 18” stainless barrel, 13.5” Noveske NSR handguard, Gen 1 Noveske upper receiver. Purchased from dealer in 2012. I’ve shot exactly 1106 rounds of Black Hills MK262 mod 1 through it. I used it primarily for hunting coyotes so it’s got some...
Have a brand new gen 3 G17 complete upper assembly.
Factory test fired only.
Still has assembly grease.
$350 shipped conus.
The Only trades I will consider....
1. Gen3 G21, G41 (used is fine as long as not a Leo trade in)
2. Gen 3 G19, G17 lower parts kits
3. Threaded gen 3 g19 barrels
4...
SOLD
For sale is a Aero Precision 16" AR15 Complete upper. It has a Ballistic Advantage mid length gas heavy fluted 416r stainless match grade barrel with a 223 wylde chambering and 1/8 twist. This barrel has a 1 MOA guarantee with quality ammo. The barrel is free floated in an Aero Precision...
Ad correction: $80
6.5 Grendel Anderson upper for sale as I took this in on trade for all the optics and lower.
1-8" twist 16" stainless steel barrel
Anderson Keymod handguard
BCG w/bolt SOLD
Gas block/tube SOLD
Charging handle SOLD
60 rounds of Hornady Black 123gr ELD Match ammo SOLD
Two...
Complete A2 Carbine Upper build from a Cardinal Forge A2 receiver and CMMG Chrome Lined 14.5” barrel that has an a2 flash hider pin and welded for a total length of 16”. This upper has been test fired and has sat in safe ever since. Comes with BCG and CH.
$350 local pick up in Hillsboro.
$225.00
.750 gas block and carbine length gas tube
New
barrel length is 10.5"
41V50 chrome molly
PSA full auto bolt carrier
charging handle
12" free float
Block rail
painted in Duracote tactical gray (rail)
fluted muzzle can
all new
Rock River Arms Varmint Complete Upper 20" Air Gauged. Upper is Cryogenically treated by
Firearms Cryo Barrel Stress Stabilization | 300 Below, Inc.
Heavy Crowned Barrel, Match Stainless Steel Bull Barrel-1:8 Twist Barrel. Shoots tiny groups and coyotes have not liked this. I have only shot 55...
SOLD
For sale is an Aero Precision 16" 5.56 1/7 twist mid length gas Ballistic Advantage pencil profile barreled complete upper in ceracoat FDE. Comes with Aero's new Atlas lightweight 12" rail. This upper shoots great, extremely lightweight. Less than a hundred rounds down it. Comes with all...
I bought this about 8 years ago and never built it into a rifle. Unfired!
Bravo Company factory built upper with factory pinned A2X. Really nice upper with bright T-markings.
This is from the heyday of BCM quality. I believe it is better than just about any current offering. $340 Let me...
Aasembled PSA upper with charging handle and bolt carrier group (w/logo)
In excellent condition with approx 200 rounds fired. Thoroughly cleaned
$130 picked up in aloha or shipped
ONLY trades I’m after (unless it’s worth a lot more) is a mossberg 930 JM 22” barrel plus cash on my end.