Monolithic M4 Le6943 Upper Group 11.5in With BCG And Sights
$1,184.50 at Kentucky Gun Co · 5 stores
In stock
Colt M4 to M5 Carbine 5.56x45mm NATO 10.3in M-LOK Upper Receiver Heavy Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese Phosphate Black
No ratings yetBest price
$1,059.00at OpticsPlanet
Out of stock Sale checked Oct 22, 2026
In stock now instead
- Monolithic M4 Le6943 Upper Group 11.5in With BCG And Sights $1,184.50at Kentucky Gun Co
- Colt EPR II Pro AR-15/M16/M4 5.56x45mm NATO 16.1in M-LOK Upper … $929.99at OpticsPlanet
- Patriot Ordnance Factory Renegade Plus 10.5" Complete Upper 5.5… $1,053.50at Kentucky Gun Co
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet | $1,059.00Salechecked Oct 22, 2026 | Out of stock | Buy at OpticsPlanet |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Similar upper receivers in stock
This part is out of stock at every store we track. These similar upper receivers are in stock, with today's prices.
Colt EPR II Pro AR-15/M16/M4 5.56x45mm NATO 16.1in M-LOK Upper Receiver Government Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese Phosphate
$929.99 at OpticsPlanet
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Patriot Ordnance Factory Renegade Plus 10.5" Complete Upper 5.56x45mm 1:8, Black
$1,053.50 at Kentucky Gun Co · 5 stores
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Patriot Ordnance Factory Renegade Plus 16.5" Complete Upper 5.56x45mm 1:8, Black
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Maxim Defense Industries MDX 505 PDX/SCW Compatible URG Upper Receiver 5.56 NATO Hate Brake 1/2-28 Thread 5.5in Barrel Arid Earth
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M-LOK Mk116 Mod 1-M 223 Wylde Upper Receiver W/16.1" Bbl
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Price history
Dashed line = out of stock. Tracking since Oct 14, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| OpticsPlanet | $1,059.00 | $1,059.00 | $1,059.00 |
Since Oct 14, 2026.
About this part
The Colt M4 to M5 Carbine 5.56x45mm NATO 10.3in M-LOK Upper Receiver Heavy Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese Phosphate Black is a 10.3" 5.56 / .223 upper receiver from Colt. One store lists it, OpticsPlanet at $1,059.00.
Fits and works with
- Caliber
- 5.56 / .223 · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Gas system
- Carbine · Handguards
- Muzzle thread
- 1/2x28 · Muzzle devices
- Barrel length
- 10.3" · Handguards
- Handguard length
- 10.3" · Barrels
Specifications
- Manufacturer
- Colt
- Color
- Black
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
From the manufacturer
Colt M4 to M5 Carbine 5.56x45mm NATO 10.3in M-LOK Upper Receiver Heavy Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese Phosphate Black. 56x45mm NATO 10.3in M-LOK Upper Receiver. These AR15 Upper Receivers from the professional product specialists at Colt are designed using dependable and reliable resources to be able to supply you with a product which will be effective for quite some time. Designed using some of the most useful available substances and engineering these particular AR15 Upper Receivers through the product professionals at Colt will last you an unbelievably long time. Colt has been making high quality products for a number of years and the Colt M4 to M5 Carbine 5.56x45mm NATO 10.3in M-LOK Upper Receiver is their approach to demonstrating just how much they care. At OpticsPlanet we ensure that it is our obligation to obtain the perfect product for all your requirements and exhibiting the Colt M4 to M5 Carbine 5.56x45mm NATO 10.3in M-LOK Upper Receiver is something that we are delighted to offer. Specifications for Colt M4 to M5 Carbine 5.56x45mm NATO 10.3in M-LOK Upper Receiver: Manufacturer: Colt Caliber: 5.56x45mm NATO Barrel Length: 10.3 in Barrel Profile: Heavy Gas System Length: Carbine Length Barrel Twist Rate: 1-7 Firearms Threads Per Inch: 1/2x28 Handguard Type: Free-Float Muzzle Device: A2 Flash Hider Finish: Manganese Phosphate Color: Black Gun Model: M4 M16 AR-15 Fabric/Material: Aluminum Handguard Style: M-LOK w/ Top Picatinny Rail System Gun Rail: M-LOK Picatinny Gun Type: Rifle Gun Make: Colt AR Platform Bolt Carrier Group Included: MIL-SPEC Features of Colt M4 to M5 PDW Upper Reciever Kit: Package Contents: Colt M4 to M5 Carbine 5.56x45mm NATO 10.3in M-LOK Upper Receiver What firearm models does the manufacturer say Colt M4 to M5 Carbine 5.56x45mm NATO 10.3in M-LOK Upper Receiver is compatible with? The manufacturer says that Colt M4 to M5 Carbine 5.56x45mm NATO 10.3in M-LOK Upper Receiver is compatible with AR-15 M4 M16Colt CM556-10H-CK: M4 to M5 Carbine 5.56x45mm NATO 10.3in M-LOK Upper Receiver Heavy Carbine Length 1-7 Twist 1/2x28 A2 Flash Hider Manganese Phosphate Black
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