I have no hands-on experience with this device and donвЂ™t even know the name of the original manufacturer. It looks like it would work much like the Lightning Link by depressing the disconnector when the bolt closes and releasing the hammer to enable full-auto fire. The only other requirement seems to be the use of an M-16 bolt carrier. Swift LinkДЄt first glance, the Swift Link appears to be a little more robust than the Lightning Link and seems to be more user-friendly regarding compatibility with different lower receivers. The sear stops the hammer in the cocked position when the trigger is released. As the trigger is held rearward, the movement of the bolt carrier continuously cocks the hammer and forward movement of the carrier strikes the upright of the link as the bolt locks in battery, releasing the hammer, and firing the rifle. When the bolt carrier strikes the top of the link, the bottom portion swivels to the rear, moving the body of the link rearward and releases the hammer from the disconnector hook. The upright portion sits between the rear takedown pin post of the upper and the bolt carrier. The Lightning Link lays flat in the lower receiver, with the forward opening fitting over the disconnectorвЂ™s hook. The Lightning Link works by pulling the disconnector to the rear and releasing the hammer. The only thing holding the hammer in the cocked position is the disconnector. When the trigger is held rearward, the sear is below the arc of the hammer notch. When the trigger is released, the hammer moves from under the disconnector hook and is caught by the trigger sear in the hammer sear notch, making it necessary to pull the trigger for each shot. Using one in a modern rifle requires some tuning and other work.Д«ecause the trigger is being held back, the disconnector hook is pushed forward and in position to catch the hammer, preventing it from following the carrier forward. If you hold the trigger after a shot is fired, the sear will not catch in the hammerвЂ™s sear notch when the hammer cocks because the sear is depressed below the arc of the hammer notch.ДЄ Lightning Link looks like something someone came up with in their garage, which isnвЂ™t terribly far from the truth. When the carrier returns to the forward position, the hammer is held in this position by the sear located on the forward part of the trigger catching in the sear notch, on the hammer. In semi-auto mode, the hammer is cocked as the bolt carrier moves rearward. ItвЂ™s not uncommon for these to break on extended use, and once they break, youвЂ™ve just destroyed an over $15,000 machinegun. Lastly, the Lightning Link is a fragile piece of hardware. If you have a commercial bolt carrier, or even an M-16 carrier, these will need to be milled to work with the Lightning Link. The other challenging part is that the Lightning Link only works with Colt SP-1 bolt carriers. Again, milling will be required to make it fit.

Many modern lowers have a вЂњLow Shelf,вЂќ but they may not be rounded in the rear properly to accommodate a Lightning Link. These lowers can work if the shelf is milled away. After 1989, Colt added whatвЂ™s known as a вЂњHigh ShelfвЂќ in their lower receivers to prevent installation of a Lightning Link. ThatвЂ™s right, the Lightning Link only drops into a Colt SP-1 and a handful of other, early civilian-made AR-15s such as Bushmaster, Sendra, Essential Arms, and most PWA pre-ban lower receivers. The market share was largely owned by Colt and their SP-1 version of the AR. The other downside is that itвЂ™s a product of its time, meaning when it was designed, there were less than a handful of companies making AR-15s. Not that thereвЂ™s anything wrong with that! There are several manufacturers making kits to allow select-fire with the Lightning Link by modifying real M-16 fire control parts to function with the Lightning Link in an AR-15.ДЄR-15 Lower Parts Kits from $49.99 at Palmetto Armory AR-15 Lowers from $84.99 at Stag Arms Once itвЂ™s installed, the rifle is full-auto only. It doesnвЂ™t give the shooter select-fire capability. In theory, itвЂ™s a two-way conversion thatвЂ™s installed and removed easily. There are a few caveats regarding the use of this device, however.

This is a drop-in part to convert a commercial AR-15 into a fully automatic firearm. Auto Connector, fewer than 900 of these were manufactured and in the NFA registry prior to May 1986. Another fantastic invention that came about in the 1980s was the вЂњLightning Link.вЂќ Properly known as the S.W.D., Inc.

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