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The FightLite MCR (Mission Configurable Rifle) Dual-Feed Upper is one of the most interesting builds you can bolt onto a mil-spec AR-15. It drops right onto any standard AR/M4 type lower receiver without permanent modification, and it's backward compatible with AR15/M16 pattern guns going all the way back to 1963. What sets it apart is the dual-feed system: you can run it off standard AR15/M16 box magazines or feed it M27 linked ammunition, and switching between the two is done at your discretion. That gives you the reach of a magazine-fed carbine and the sustained firepower of a light support weapon in one package.
This compact version is built around a 12.5" quick-change barrel that swaps out in about three seconds, so you can adapt the gun to the mission without a trip to the bench. Feeding is handled by a short-stroke gas piston system rather than direct impingement, which keeps hot gas and carbon out of the receiver and helps the gun run clean and reliable when conditions get ugly. The upper, feed cover, and charging handle are precision machined from 7075-T6 billet, and the whole assembly wears a hardcoat anodized black finish.
A full-length MIL-STD 1913 co-planar Picatinny rail runs across the top, giving you plenty of real estate for optics, backup irons, lights, and whatever else your setup calls for. The barrel is 1:7 twist with a 1/2-28 threaded muzzle, so it stabilizes heavier 5.56 loads and accepts common muzzle devices. This particular RS variant also adds dry film lubrication on the high-friction internal surfaces, which is a nice touch for cutting down wear and keeping things moving in extreme cold or dusty environments.
If you've wanted a belt-fed capable platform without committing to a whole new firearm, this is about as straightforward as it gets. Pair it with a quality mil-spec lower and you've got a genuinely versatile setup.
It's designed to drop onto any standard mil-spec AR/M4 type lower receiver with no permanent modification. FightLite lists it as backward compatible with AR15/M16 pattern guns produced as far back as 1963. The kit includes an H3 buffer and belt-feed main action spring, so you'll want to install those to run the belt-fed system correctly.
Yes, that's the whole point of the dual-feed design. You can run standard AR15/M16 box magazines or M27 linked ammunition, and you choose which one at your discretion. It lets the same gun function as an optic-ready carbine or a lightweight support weapon depending on how you set it up.
The short-stroke gas piston system vents gas and carbon away from the receiver rather than dumping it back into the action. That keeps the internals running cleaner and cooler, which pays off during sustained fire and in dusty or cold conditions. This RS variant also adds dry film lubrication on the high-friction surfaces for extra reliability.
The quick-change barrel system is designed to swap in roughly three seconds without tools. That makes it easy to adapt the platform for different tasks on the fly. The 12.5" barrel here is the compact configuration, with a 1:7 twist and 1/2-28 threaded muzzle for common devices.
| UPC | 850017078017 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | MCR556DFRS |
| Action | |
| Barrel Length | 12.5" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Color | Black |
| Length | 25.5'' |
| Model | |
| Product Type | Upper |
| Sights | Adjustable |
| Style | Complete |
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