Upper Receiver Parts & Kits for Sale | AR-15 Upper Receiver Assembly — Mid State Firearms

Showing 1–48 of 378 results

-33%

*Combo Deal* Microbest Chrome BCG and Ballistic Advantage 16″ 5.56 Ar15 Barrel
Original price was: $299.00.Current price is: $199.00. View Product
1/2-28 Thread Protector – Knurled With Wrench Flats, Black -Phalanx Tactical Precision
Thread Pitch: 1/2x28
$12.95 View Product
1/2-28 Thread Protector – Knurled, Black -Phalanx Tactical Precision
Thread Pitch: 1/2x28
$12.95 View Product
-37%
New!

16″ AR-15 Barrel — 416R Stainless, 223 Wylde 1:8 Twist, M4 Profile, Carbine
Caliber: 5.56/.223
Barrel Size: 16"
Original price was: $189.00.Current price is: $119.00. View Product
-37%
New!

16″ AR-15 Barrel — 416R Stainless, 5.56 Nato 1:8 Twist, M4 Profile, Carbine
Barrel Size: 16"
Caliber: 5.56/.223
Original price was: $189.00.Current price is: $119.00. View Product
-20%

16″ MSF 5.56 Nato 1/7 MidLength Ar15 Upper – XTreme CNC MLok Rail
Caliber: 5.56/.223
Rail Length: 15"
Original price was: $499.00.Current price is: $399.00. View Product
16” 223 wylde 1:8 black 4150 straight fluted HBAR barrel
$149.00 View Product
16” 5.56 / 223 1:7 carbine ultralight Ar15 pencil barrel
$129.00 View Product
-50%

18″ AR-15 Complete Upper – 416R Stainless Fluted .223 Wylde 1:8, Microbest BCG
Caliber: 5.56/.223
Model Style: Ar-15
Original price was: $799.00.Current price is: $399.00. View Product
-50%

20″ AR-15 Complete Upper – 416R Stainless Fluted .223 Wylde, Microbest BCG
Style: Rifle
Barrel Size: 20"
Original price was: $799.00.Current price is: $399.00. View Product
5/8-24 Thread Protector – Knurled with Wrench Flats, Black Phalanx Tactical Precision
Thread Pitch: 5/8x24
$12.95 View Product
5/8-24 Thread Protector – Knurled, Black Phalanx Tactical Precision
Thread Pitch: 5/8x24
$12.95 View Product
-23%
New!

8.5″ AR-15 Pistol Barrel — 5.56 NATO M4 Contour, 1:7 Twist 4150 CMV
Caliber: 5.56/.223
Barrel Size: 8.5"
Original price was: $129.00.Current price is: $99.00. View Product
Left hand eject 450 bushmaster 18” Ar15 complete lefty upper
$1,199.00 View Product
-38%
New!

MidState Defense 12.5″ AR-15 Barrel — 5.56 Nato 1/8, 4150 CMV, Nitride, Carbine Gas
Barrel Size: 12.5"
Caliber: 5.56/.223
Original price was: $159.00.Current price is: $99.00. View Product
-30%
New!

MSF 16″ 4150 Fluted 223 Wylde Complete Ar15 Upper with 10″ Gen3 Rail, BcG, Charging Handle
Original price was: $499.00.Current price is: $349.00. View Product
-38%
New!

RBC 12.5″ AR-15 Barrel — 4150 CMV, Parkerized, 5.56 Nato 1:7 Mid Length
Barrel Size: 12.5"
Caliber: 5.56/.223
Original price was: $159.00.Current price is: $99.00. View Product
Thread Adapter – 1/2×28 to 5/8×24 – Phalanx Tactical Precision
Thread Pitch: 1/2x28
$17.95 View Product
-26%

Combo Deal! Microbest Chrome ‘blem’ BCG and Aero Precision Breach Ambi Charging Handle

Rated 5.00 out of 5 based on 1 customer rating
(1)
Original price was: $269.00.Current price is: $199.00. View Product
-33%

Combo Deal: Microbest M16 Full Chrome Bolt Carrier Group – MPI , HPT , OCKS, Sprinco + Breek Warhammer Charging Handle
Original price was: $239.00.Current price is: $159.00. View Product
-37%

16″ Spiral Flute Rainbow PVD Oilslick 5.56 / 223 SS Ar15 Barrel
Barrel Size: 16"
Caliber: 5.56/.223

Rated 4.40 out of 5 based on 5 customer ratings
(5)
Original price was: $395.58.Current price is: $249.00. View Product
-46%

18″ Spiral Flute Rainbow PVD Oilslick .223 Wylde SS Ar15 Barrel
Caliber: 5.56/.223
Barrel Size: 18"

Rated 4.50 out of 5 based on 4 customer ratings
(4)
Original price was: $461.72.Current price is: $249.00. View Product
-29%

16″ Black Fluted .223 Wylde Ar-15 Upper
Caliber: 5.56/.223
Barrel Size: 16"

Rated 4.00 out of 5 based on 2 customer ratings
(2)
Original price was: $349.99.Current price is: $249.99. View Product
-37%

Microbest m16 Full Chrome HPT / MPI Bolt Carrier Group BCG, Sprinco, OCKS, Phos Extractor, blem
Caliber: 5.56/.223, 300 BLK

Rated 4.50 out of 5 based on 16 customer ratings
(16)
Original price was: $189.00.Current price is: $118.99. View Product
-43%

13.9” MSF x Criterion pinned & welded 5.56 / 223 Wylde 1:8 Ar15 Mlok Upper

Rated 5.00 out of 5 based on 1 customer rating
(1)
Original price was: $1,049.00.Current price is: $599.00. View Product
-20%

10.5″ 300 Blackout Grab Bag Upper
Barrel Size: 10.5"
Caliber: 300 BLK

Rated 4.93 out of 5 based on 14 customer ratings
(14)
Original price was: $249.99.Current price is: $198.99. View Product
-20%

24″ 223 Wylde 1/8 Diamond Fluted Stainless Ar-15 Upper with M-Lok rail
Barrel Size: 24"
Style: Rifle

Rated 4.71 out of 5 based on 7 customer ratings
(7)
Original price was: $499.00.Current price is: $399.00. View Product
-50%

18″ Grab Bag / Clearance / Blem Ar15 RIFLE Upper w/ Free Float Handguard
Barrel Size: 16"
Caliber: 5.56/.223

Rated 5.00 out of 5 based on 6 customer ratings
(6)
Original price was: $499.00.Current price is: $249.00. View Product
-20%

12.5” 308 ar10 / dpms lr308 low profile upper
Original price was: $499.00.Current price is: $399.00. View Product
-25%

16” Mid Length Diamond Fluted 223 wylde rainbow oilslick chameleon barrel
Original price was: $399.00.Current price is: $299.00. View Product
-26%

13.9″ 5.56 / 223 GOV PROFILE MIDLENGTH AR 15 BARREL, BA MODERN SERIES
Barrel Size: 13.9"
Caliber: 5.56/.223

Rated 5.00 out of 5 based on 1 customer rating
(1)
Original price was: $160.00.Current price is: $119.00. View Product
-27%

16” 5.56 Ultralight 2lb Ar15 Sport Upper
Thread Pitch: 1/2x28
Caliber: 5.56/.223

Rated 4.00 out of 5 based on 1 customer rating
(1)
Original price was: $299.00.Current price is: $219.00. View Product
-50%

16″ Ar15 5.56/223 Upper with Light MLOK Handguard
Barrel Size: 16"

Rated 4.62 out of 5 based on 13 customer ratings
(13)
Original price was: $399.00.Current price is: $199.00. View Product
-50%

16” 223 Wylde Mid Length Diamond Fluted 1/8 Ar15 stainless barrel
Caliber: 5.56/.223
Barrel Size: 16"
Original price was: $399.00.Current price is: $199.00. View Product
-29%

17.1” SS 223 Wylde Ar15 Upper with 15” mlok rail – flat spiral flute
Original price was: $549.00.Current price is: $389.00. View Product
-38%

16″ 9mm Black Nitride Ar15 / Ar9 Barrel, 1/2-28 threads
Barrel Size: 16"
Caliber: 9mm
Original price was: $159.00.Current price is: $99.00. View Product
22” 243 win ar10 lr308 stainless barrel
$299.00 View Product
-42%

24″ 223 Wylde 1/8 Diamond Fluted SS Ar-15 Upper, Threaded
Style: Rifle
Caliber: 5.56/.223

Rated 4.20 out of 5 based on 5 customer ratings
(5)
Original price was: $599.00.Current price is: $349.00. View Product
-42%

24″ 223 Wylde 1/8 Diamond Fluted 2tone SS Ar-15 Upper, Threaded
Style: Rifle
Thread Pitch: 1/2x28

Rated 5.00 out of 5 based on 3 customer ratings
(3)
Original price was: $599.00.Current price is: $349.00. View Product
-50%

24″ 223 Wylde 1/8 Spiral Fluted 2tone SS Ar-15 Upper Assembly, Crowned
Barrel Size: 24"
Model Style: Ar-15

Rated 4.25 out of 5 based on 4 customer ratings
(4)
Original price was: $599.00.Current price is: $299.00. View Product
SOLGW NOX MUZZLE DEVICE 5.56, 1/2-28
$115.00 View Product
SOLGW NOX nox9 MUZZLE DEVICE 5.56, 1/2-28 9 Hole Neutral
$115.00 View Product
1/2-28 Jam Nut, Muzzle Timing Indexing Device for Ar15
$0.99 View Product
-67%

24” .936 Heavy Bull Barrel for Ar15. 2 tone spiral fluted Stainless 223 wylde 1:8
Caliber: 5.56/.223
Barrel Size: 16"

Rated 4.60 out of 5 based on 5 customer ratings
(5)
Original price was: $599.00.Current price is: $199.00. View Product
2BO Double Port Ar15 Muzzle Brake Outside Threaded
Thread Pitch: 1/2x28, 5/8x24
Caliber: .308, 5.56/.223, 9mm
$34.99 View Product
-30%

2lb Ultralight Sport Ar15 Upper – 16″ 5.56 1/7, MLOK Rail, With Microbest BCG

Rated 5.00 out of 5 based on 1 customer rating
(1)
Original price was: $499.00.Current price is: $349.00. View Product
-59%

3″ 9mm Ar15 Pistol Barrel, 5/8-24 Nitride
Caliber: 9mm
Barrel Size: 3"

Rated 5.00 out of 5 based on 4 customer ratings
(4)
Original price was: $119.00.Current price is: $49.00. View Product
3FO-S Flash Hider Short Outside Threaded – .223/5.56
Thread Pitch: 1/2x28
$34.99 View Product

Showing 1–48 of 378 results