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Fightlite
The Fightlite MCR Mil-Spec Dual Feed Upper with M-LOK is a belt-fed upper receiver assembly engineered to transform your existing AR15, M16, or M4 lower receiver into a mission-configurable platform without permanent modification. Built on Fightlite's proven MCR technology, this 12.5-inch upper handles both standard AR15/M16 box magazines and M27 linked ammunition, giving you genuine firepower flexibility that goes beyond conventional carbine setups. It's purpose-built for shooters—responsible armed citizens, law enforcement, and professional security personnel—who demand reliability, versatility, and performance in real-world conditions.
What sets the MCR apart is the engineering underneath: short-stroke gas-piston operation delivers extreme reliability in adverse environments, while the quick-change barrel system lets you swap to a fresh tube in three seconds flat without tools. The 12.5-inch barrel comes threaded 1:7 RHT with a RIP brake muzzle compensator included. The upper is precision-machined from 7075-T6 billet aluminum with a manganese phosphate and Type III Class 2 hardcoat anodize finish for maximum corrosion and wear resistance, and Fightlite applies dry film lubricant to critical high-friction surfaces so the rifle runs clean and smooth even in extreme conditions.
The M-LOK co-planar handguard with integrated rail interface gives you modern accessory mounting flexibility. Everything needed to build a complete upper is in the box: adjustable sight set, quick-change barrel handle, full-auto bolt carrier, extended bolt catch, magazine adapter, 100 M27 links, MIL-Spec H3 buffer, carbine stock spacer, and operator's manual. Drop it onto any MIL-Spec lower and you're ready to configure for your mission. Made in the USA.
| Brand | Fightlite |
| Product Type | Upper Receiver Assembly |
| Caliber | 5.56 x 45mm NATO |
| Barrel Length | 12.5 inches |
| Barrel Thread | 1:7 RHT, -28 TPI |
| Gas System | Short-stroke gas piston |
| Ammunition Feed | Dual-feed (AR15/M16 magazines and M27 linked ammunition) |
| Upper Receiver Material | 7075-T6 billet aluminum |
| Feed Tray Material | Billet steel |
| Finish | Manganese phosphate and Type III Class 2 hardcoat anodize |
| Handguard | M-LOK co-planar with rail-interface system |
| Bolt Carrier | Full-auto |
| Compatibility | MIL-Spec AR15/M16/M4 lower receivers (no permanent modification required); backward compatible to AR15/M16 models from 1963 onward |
| Country of Origin | USA |
Yes. The MCR Mil-Spec upper is a drop-on assembly designed to interchange with any MIL-Spec AR15, M16, or M4 lower receiver without permanent modification. It is backward compatible to AR15/M16 models produced as early as 1963.
The dual-feed upper accepts both standard AR15/M16 box magazines and M27 linked ammunition, giving you the flexibility to run either magazine-fed or belt-fed configurations depending on your mission.
The quick-change barrel system allows you to swap barrels in approximately three seconds without tools, using the included quick-change barrel handle.
The upper ships complete with an adjustable sight set, quick-change barrel handle, full-auto bolt carrier, extended bolt catch, magazine adapter, 100 M27 links, MIL-Spec H3 buffer, carbine stock spacer, RIP brake muzzle compensator, and operator's manual.
Fightlite
The Fightlite MCR Mil-Spec Dual Feed Upper with M-LOK is a belt-fed upper receiver assembly engineered to transform your existing AR15, M16, or M4 lower receiver into a mission-configurable platform without permanent modification. Built on Fightlite's proven MCR technology, this 12.5-inch upper handles both standard AR15/M16 box magazines and M27 linked ammunition, giving you genuine firepower flexibility that goes beyond conventional carbine setups. It's purpose-built for shooters—responsible armed citizens, law enforcement, and professional security personnel—who demand reliability, versatility, and performance in real-world conditions.
What sets the MCR apart is the engineering underneath: short-stroke gas-piston operation delivers extreme reliability in adverse environments, while the quick-change barrel system lets you swap to a fresh tube in three seconds flat without tools. The 12.5-inch barrel comes threaded 1:7 RHT with a RIP brake muzzle compensator included. The upper is precision-machined from 7075-T6 billet aluminum with a manganese phosphate and Type III Class 2 hardcoat anodize finish for maximum corrosion and wear resistance, and Fightlite applies dry film lubricant to critical high-friction surfaces so the rifle runs clean and smooth even in extreme conditions.
The M-LOK co-planar handguard with integrated rail interface gives you modern accessory mounting flexibility. Everything needed to build a complete upper is in the box: adjustable sight set, quick-change barrel handle, full-auto bolt carrier, extended bolt catch, magazine adapter, 100 M27 links, MIL-Spec H3 buffer, carbine stock spacer, and operator's manual. Drop it onto any MIL-Spec lower and you're ready to configure for your mission. Made in the USA.
| Brand | Fightlite |
| Product Type | Upper Receiver Assembly |
| Caliber | 5.56 x 45mm NATO |
| Barrel Length | 12.5 inches |
| Barrel Thread | 1:7 RHT, -28 TPI |
| Gas System | Short-stroke gas piston |
| Ammunition Feed | Dual-feed (AR15/M16 magazines and M27 linked ammunition) |
| Upper Receiver Material | 7075-T6 billet aluminum |
| Feed Tray Material | Billet steel |
| Finish | Manganese phosphate and Type III Class 2 hardcoat anodize |
| Handguard | M-LOK co-planar with rail-interface system |
| Bolt Carrier | Full-auto |
| Compatibility | MIL-Spec AR15/M16/M4 lower receivers (no permanent modification required); backward compatible to AR15/M16 models from 1963 onward |
| Country of Origin | USA |
Yes. The MCR Mil-Spec upper is a drop-on assembly designed to interchange with any MIL-Spec AR15, M16, or M4 lower receiver without permanent modification. It is backward compatible to AR15/M16 models produced as early as 1963.
The dual-feed upper accepts both standard AR15/M16 box magazines and M27 linked ammunition, giving you the flexibility to run either magazine-fed or belt-fed configurations depending on your mission.
The quick-change barrel system allows you to swap barrels in approximately three seconds without tools, using the included quick-change barrel handle.
The upper ships complete with an adjustable sight set, quick-change barrel handle, full-auto bolt carrier, extended bolt catch, magazine adapter, 100 M27 links, MIL-Spec H3 buffer, carbine stock spacer, RIP brake muzzle compensator, and operator's manual.
