But for those of you without trigger time behind a belt-fed beast, here’s the quick and dirty version. While most AR experts utilize a punch and a piece of cardboard or even cloth to protect the lower receiver while driving the roll pin in, I just took an old furniture nail and ground off the tip – but I also wrapped it in an old piece of holster leather since I ended up installing the catch on a friend’s very expensive transferrable M4 lower.Īfter that, simply put the MCR on top of the host AR lower, and you’re almost ready to roll!Īnyone who has ever run an M249 SAW can load the MCR in their sleep – the manual of arms is very similar. The Fightlite MCR features a Picatinny rail handguard covering its short-stroke piston system. The other step is more difficult and requires a shooter to replace their bolt catch with a proprietary extended one. Doing so is very easy and doesn’t require any tools. To start things off, a shooter should replace their existing AR-15 lower’s recoil buffer and spring with the ones provided by FightLite with the MCR. The FightLite MCR ships with a custom Bolt Release to accommodate the side charging handle and feed tray. But there’s actually a little more complicated than that. I had originally assumed that like nearly every other AR upper receiver group, the installation consisted of popping out two takedown pins, replacing the upper, and reinstalling said pins. One thing that was a little unexpected, was the installation process for the FightLite MCR upper. Installing the MCRĪlthough my time with belt-fed firearms is somewhat limited, adapting to the MCR was fairly straightforward and became second nature pretty quickly. Installing a replacement barrel is simply the same procedure in reverse. Then press the barrel release tab just forward of the receiver top rail, and finally pull forward (towards the muzzle) on the barrel swap handle. To replace the barrel, a shooter needs only to clear the action and lock it open by holding the bolt release while charging the action. Using a belt to load the MCR is a breeze. It’s also why the gun incorporates quick-change barrels that allow shooters to swap them out during extended firing sessions where the gun can overheat while providing suppressive fire. This is why both versions can feed from either a standard M249 SAW belt or a STANAG magazine. One of the cooler features of the MCR is how it’s not just a modified AR upper, but a purpose-built SAW replacement. (The link only works in the semi-auto-only version that incorporates a bolt carrier cut to Colt SP01 specifications.) Both the full and semi-auto versions are compatible with any semi-automatic AR lower, but function in only semi-automatic mode unless the shooter has a transferrable full-auto trigger pack or a registered lighting link. The FightLite MCR is a lightweight, closed-bolt, belt-fed, short-stroke piston-driven semi-or-fully-automatic upper receiver for the AR-15.
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