They include construction (precision built or 18-gauge barreled versus pistol built or short-barreled rifles), optics, triggers (single-stage triggers versus double-stage), type of rifle (semi-auto versus full-auto), but let us cut to the chase for the sake of brevity. As a Mil-spec AR-15, an A2 Handguard and Collapsible Synthetic Stock are installed on the rifle, too. Along with these, the DB-15 has a six-position collapsible stock and a MPI Mil-spec 8620 bolt carrier. The Nitride M4 Carbine sports a black aluminium finish, while the barrel uses chrome-molyvanadium steel.
The DB-15 offers a 4140 Chrome-moly Vanadium 16 barrel, which is finished in melonite to provide a smoother action. The Nitride M4 Carbine also features a single 30 round magazine, an A2 handguard, and a flash hider. While there is the rare dispersion model which has a sixteen-inch barrel, a rifle-length gas system is typically used with the eighteen-inch barrel. Meanwhile, a 15-inch handguard with free floating action protects both the 16-inch carbine-length barrel and the medium-length gas system.
You will be able to use your preferred handguard, since the gun is designed for use with most handguards at carbine length. Depending on how you prefer to handle the gun, a 16-inch is usually a standard barrel length. If you are used to larger barrels, you might have to spend a bit more practice with this pistol to adjust to the weight difference.
The semi-auto makes the AR-15 noticeably slower to fire than a military-grade variant, the M4, which has a three-shot burst (three rounds fired at the push of the trigger) and a full-auto (the gun will empty its entire magazine unless the user releases the trigger). Overlooking this detail can result in an unpleasant experience, so be sure to clarify if the finished AR-15 is a completed rifle or not. It is worthwhile to own a multi-functional rifle, since you can try out the unique features to see which one works best for you. This modularity also makes the AR-15 very versatile, because at a moments notice, with the correct parts and accessories, it can be configured to function like a DMR (designated marksmans rifle) for precision shooting, a hunting rifle (using larger caliber barrels and ammunition), or, out of the box, a CQB (close-quarters combat) carbine, by just swapping upper receivers and barrels.
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