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In mathematics, the infinite series 1/2 + 1/4 + 1/8 + 1/16 + ··· is an elementary example of a geometric series that converges absolutely.
There are many different expressions that can be shown to be equivalent to the problem, such as the form: 2−1 + 2−2 + 2−3 + ...
The sum of this series can be denoted in summation notation as:
BRAND NEW/NEVER FIRED Springfield Saint VICTOR AR-15 5.56/.223 16" barrel 1:8 twist
Comes with a Springfield Armory 1x tactical carrying case, 1x chamber lock and x1PMAG 30 round.
OEM information at: https://www.springfield-armory.com/saint-series/saint-victor-ar-15-rifles/
Edit: one note worth mentioning is that this barrel is not dimpled for the gas block screw. If you are not comfortable with dimpling the barrel yourself or using a clamp on gas block (my recommendation) then I would search for a different barrel...
New, never fired.
I Mounted it on an Upper Rcvr, then removed it.
Bear Creek Arsenal M4 Profile 1:8 twist Stainless Steel 16" Carbine length Gas System.
These show up for $115 to $140 on sale from various suppliers.
$100.00 and it is yours.
Prefer FTF SE PDX / Milwaukie area.
For sale is an Aero Precision, Ballistic Advantage, 16" barrel. It's chambered in 223 Wylde (can shoot 5.56 or 223) and has a 1:8 twist. Included is a Faxon Firearms lightweight gas block, mid length gas tube, and a thread protector. This barrel shoots lights out, very accurate. Around 300...
I have a Faxon 1:8 twist 556 NATO 14.5” Mid-length Gunner profile barrel 4150QPQ that I decided to replace. It’s had less than 200rnds through it, all factory ammo, no reloads. Comes with Faxon ultra low profile set screw gas block. Never been fired suppressed, always quality FMJ ammunition...
Up for sale is an AR-15 barreled upper.. it's assembled by Mid State Firearms in Mississippi, so properly headspaced and test fired. Check out their site, they have some cool stuff (when in stock, unlike now).
I have not fired this upper (I do have another one of their uppers I have shot and it...
Hello I’m selling a complete AR-15 upper with BCG and charging handle. The barrel is 16” .223 Wylde (can fire 5.56 or .223) 1:8 twist. Purchased from PSA several years
This was used for my “truck gun” so it has some cosmetic dings, but only 40 rounds fired through it. Also has cheap polymer...
20” bull barrel .223 WYLDE from thunder tactical. Anderson ATF lower. 3LB CMC drop in trigger. NIKON FX1000 scope. Burris quick release scope mount. Tomahawk ambidextrous charging handle.
interested in colts, antiques, Remington 700, and cash. Also coins and currency. Open to offers.
I bought this barrel ~5 years ago for a long range 5.56 build that never happened. The barrel has never been out of the packaging until now.
Red X Arms 20" 5.56 Stainless Steel BULL Spiral Fluted 1x8
These sell for $240+ on the RedX website.
$150 cash. Pickup in Issaquah (I dont...
Ended up building a 20" instead.
This barrel has been installed, but never fired.
16", 1:8 twist, 223 Wylde chamber
Mid length gas
Located in Vancouver, can meet in Portland some days... shipping $5 in the PNW
For sale is a complete upper with some very high quality components. The Upper receiver is an Aero Precision slick side forged lightweight upper. Handguard is a 13.5" Midwest Industries Combat Rail with 7 sides of M-Lok and QD attachments. The barrel is a 16" Criterion CORE 4150 CMV barrel in a...
For sale is a 16" Complete AR15 upper. The upper receiver is a slick slide lightweight 7075 T6 Aero Precision upper. Barrel is a Mid Length Pinned Gas, 16" Ballistic Advantage 416R Stainless Premium Black line Hanson Profile barrel, with a 223 Wylde chamber, 1:8 twist, and A2 muzzle device...
For sale is an complete 18" SPR rifle upper. The Upper is an 18" Ballistic Advantage 416R Stainless nitrided barrel with a 1:8 twist and 223 Wylde chamber. 15" free float M-lok rail and a VG6 Delta Muzzle Device. Comes with Magpul vertical grip, BCG, and charging handle. Bought on Black Friday...
For sale is a Ballistic Advantage heavy fluted. 416r stainless premium line barrel. It has a 223 Wylde chamber, 1:8. Twist, and rifle length gas system. Extremely soft shooting. Shoots cheap wolf and American eagle to MOA, and vmax to nearly 1/2 moa. Great barrel only a few hundred rounds...