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

Showing 1–48 of 360 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.
-20%
New!

16″ MSF 5.56 Nato 1/7 MidLength Ar15 Upper – XTreme CNC MLok Rail
Model Style: Ar-15
Thread Pitch: 1/2x28

Original price was: $499.00.Current price is: $399.00.
-50%
New!

18″ AR-15 Complete Upper – 416R Stainless Fluted .223 Wylde 1:8, Microbest BCG
Barrel Size: 18"
Style: Rifle

Original price was: $799.00.Current price is: $399.00.
-50%
New!

20″ AR-15 Complete Upper – 416R Stainless Fluted .223 Wylde, Microbest BCG
Model Style: Ar-15
Style: Rifle

Original price was: $799.00.Current price is: $399.00.
-32%

Combo Deal! Microbest Nickel Boron m16 BCG and Extended Latch Charging Handle

Original price was: $199.00.Current price is: $134.99.
-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.
-40%

“Blem” Microbest M16 Full Chrome Bolt Carrier Group – MPI , HPT , OCKS, Sprinco

17 reviews
Original price was: $199.00.Current price is: $119.00.
-37%

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

5 reviews
Original price was: $395.58.Current price is: $249.00.
-46%

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

4 reviews
Original price was: $461.72.Current price is: $249.00.
-29%

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

2 reviews
Original price was: $349.99.Current price is: $249.99.
-37%

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

15 reviews
Original price was: $189.00.Current price is: $118.99.
-20%

Microbest TiN Gold m16 Bolt Carrier Group

Original price was: $199.00.Current price is: $159.00.
-43%

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

1 review
Original price was: $1,049.00.Current price is: $599.00.
-20%

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

14 reviews
Original price was: $249.99.Current price is: $198.99.
-20%

24″ 223 Wylde 1/8 Diamond Fluted Stainless Ar-15 Upper with M-Lok rail
Barrel Size: 24"
Caliber: 5.56/.223

7 reviews
Original price was: $499.00.Current price is: $399.00.
-50%

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

5 reviews
Original price was: $499.00.Current price is: $249.00.
-20%

12.5” 308 ar10 / dpms lr308 low profile upper

Original price was: $499.00.Current price is: $399.00.
-25%

16” Mid Length Diamond Fluted 223 wylde rainbow oilslick chameleon barrel

Original price was: $399.00.Current price is: $299.00.
-26%

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

1 review
Original price was: $160.00.Current price is: $119.00.
-27%

16” 5.56 Ultralight 2lb Ar15 Sport Upper
Model Style: Ar-15
Barrel Size: 16"

Original price was: $299.00.Current price is: $219.00.
-50%

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

13 reviews
Original price was: $399.00.Current price is: $199.00.
-50%

16” 223 Wylde Mid Length Diamond Fluted 1/7 Ar15 stainless barrel
Barrel Size: 16"
Caliber: 5.56/.223

1 review
Original price was: $399.00.Current price is: $199.00.
-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.
-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.
22” 243 win ar10 lr308 stainless barrel

$299.00
-42%

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

5 reviews
Original price was: $599.00.Current price is: $349.00.
-50%

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

3 reviews
Original price was: $599.00.Current price is: $299.00.
SOLGW NOX MUZZLE DEVICE 5.56, 1/2-28

$115.00
SOLGW NOX nox9 MUZZLE DEVICE 5.56, 1/2-28 9 Hole Neutral

$115.00
1/2-28 Jam Nut, Muzzle Timing Indexing Device for Ar15

$0.99
-67%

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

5 reviews
Original price was: $599.00.Current price is: $199.00.
2BO Double Port Ar15 Muzzle Brake Outside Threaded
Thread Pitch: 1/2x28, 5/8x24
Caliber: .308, 5.56/.223, 9mm

$34.99
-30%

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

1 review
Original price was: $499.00.Current price is: $349.00.
-59%

3″ 9mm Ar15 Pistol Barrel, 5/8-24 Nitride
Thread Pitch: 5/8x24
Barrel Size: 3"

4 reviews
Original price was: $119.00.Current price is: $49.00.
3FO-S Flash Hider Short Outside Threaded – .223/5.56
Thread Pitch: 1/2x28

$34.99
-68%

4 pack of 3” 9mm ar15 ar9 barrels

Original price was: $399.00.Current price is: $129.00.
-68%

4 pack of 5” 9mm ar15 ar9 barrels
Caliber: 9mm

2 reviews
Original price was: $399.00.Current price is: $129.00.
-59%

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

4 reviews
Original price was: $119.00.Current price is: $49.00.
-17%

6.5 Creedmoor 20” stainless fluted barrel

Original price was: $299.00.Current price is: $249.00.
Aluminum 2 piece drop in mlok rail with picatinny top, carbine

$99.00
-34%

Ar15 / M16 / M4 DLC MPI Bolt Assembly

Original price was: $89.00.Current price is: $59.00.
-66%

Ar15 / M16 / M4 DLC Stripped MPI Bolt

5 reviews
Original price was: $59.00.Current price is: $19.99.
Ar15 / m16 Gas Key and OCKS gas key screws combo – reliability upgrade kit

2 reviews
$14.99
-18%

Ar15 Left Handed Builder Bundle – Receiver and Nitride BCG Combo

1 review
Original price was: $279.99.Current price is: $229.99.
-11%

Ar15 Left Handed Builder Bundle – Upper Receiver and Nickel BCG Combo

7 reviews
Original price was: $279.99.Current price is: $249.99.
-42%

ARCA MLOK Rail Mount Plate, Bipod Tripod Dovetail Adapter, M-Lok slots

Original price was: $119.00.Current price is: $69.00.
-9%

Arisaka Finger STop FS-M For MLOK Handguards

Original price was: $33.00.Current price is: $29.99.
-9%

Arisaka Indexer IDX-M For MLOK Handguards

Original price was: $33.00.Current price is: $29.99.

Showing 1–48 of 360 results