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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.
Deciding to go a different route with my upper. I love the free floats but prefer the front sight post and don’t want to have to go through taking off the delta ring etc etc. Specs are as followed.
16” barrel
Carbine length tube
Low profile gas block
A2 flash hider.
5.56 NATO 1:8 twist
Less...
---- SOLD ---- 6/4/18
PRICE NOW LOWERED 10%, to only $520
I WILL ALSO THROW IN FIVE PMAG 20 MAGAZINES, AND ONE PMAG 25 MAGAZINE, WHICH IS ANOTHER $100 VALUE. The mags are all unused, and are still sealed in their factory packaging.
I have a really nice complete 308 AR Upper from Fulton...
Upper built on an Anderson receiver.
Faxon Stainless 16”, H-BAR contour, target barrel, chambered .223/ 5.56 Wylde with a 1:8 twist.
12” ALG EMR v1, M-lok hand guard/ barrel nut system.
Rock River BCG.
This upper shoots Sub MOA. Picture shows a 3/8” group at 100 yards using Black hills 77 gr...
Hello All,
Up for sale is a brand new factory Gen 4 complete upper.
$360 FIRM cash only. No toasters or music on 8 track. Just cash.
Pictures will be posted later this afternoon.
Almost new PSA 5.56 10” upper with flash can upper. Barrel is 7”
Works 100% for the 5 or 6 mags I ran through it. Optics not included just the upper. I am open to trading for a different upper or $240
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6.8 SPC , FDE AR-15 upper with original AR Performance 16“ barrel, 11.25 Twist, Midwest Industries Free Float Handguard, Magpul Front and Rear flip up sights, BCM Gunfighter Charging Handle, BCG
Asking $150, if interested call 503-841-8380 or respond to post. No trades will be considered.
SOLD! Thank you! I have a DPMS Oracle factory upper 5.56, 1-9 twist, 16" barrel, Magpul MOE handguard with attached rail section. I purchased this around 7 years ago NEW. It has no more than 500rds through it. Has a few marks on the barrel, gas block, etc. Includes original BCG. $225 shipped...
For sale is a 16" BCA 416R Stainless Heavy Fluted barrel, freefloat keymod, carbine length gas upper chambered in .223 Wylde with a 1:8 twist. Comes complete with a MPI tested BCG and milspec charging handle. It has a BCM keymod rail section included. I'm also including a Holosun HS503G ACSS red...
Hi all,
Selling my Adams Arms Mid Length Gas System AR-15. This was a project I did when I got home from my last deployment. I built it as a truck gun that would take a ton of abuse/dirt and still fire which is why I went with the Troy Battle Sights and a piston system.This is a complete...
-SOLD, THANKS!-
$450.
Pick up in Salem/Keizer, will not ship, ad will be closed once sold. Use the conversation function.
Adams Arms 5.56 7.5” Tactical Evo piston complete upper. Includes BCG, charging handle, dust cover, angled fore grip & a mounted sling quick disconnect. No sights...
For sale is a Bear Creek Arsenal 16" Heavy Diamond Fluted, 4150 barrel, complete free float M-lok upper. The barrel is nitrided with a 1:9 twist, perfect for cheap target ammo, in a 223 wylde chamber. Comes with MPI bolt carrier group and standard charging handle. Only fired around 30 rounds...
This upper has less than 500 rounds downrange and shoots great. Torqued with aeroshell to specs.
Price reduced! 10/20/18 to 450$ shipped FedEx. PP FF preferred
-Rainier slick side upper
-Faxon limited edition hybrid .223 Wylde 1/8 mid-gas barrel dimpled for GB
-Centurion 15" CMR keymod...
Complete long -stroke gas piston operated upper in fde.
Specs as follows:
Barrel- 14.5" pinned to 16" with a pws triad flash hider, 1:8, isonite treated.
Hand guard: 12" pws keymod, free float.
Bcg- nickel Teflon plated bolt, carrier, operating rod and piston head.
Mil spec upper modified for...
Like new PSA 7 inch pistol upper with bolt carrier group and charging handle. Also has Magpul flip up sights front and rear. Less than 200 rounds fired. Zero malfunctions. Awesome set up, I just don't use it much. Cash only please. Asking $350 for everything. Text is best. 971-246-6347.
16" PSA Complete Upper. Barrel is a chrome lined FN CHF 300 blackout with carbine length gas system and 1/8" twist. I've had this upper for a while and just don't use it like I should. Could pass as new. No cosmetic issues other than some irregular machining marks under the finish on the...
For sale is a x-products .300 black out complete upper. Barrel is 12.5" and with the A2 the total length is 14.5" from the upper receiver. Asking $500 obo, need to sell by Sunday.