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Here’s a look at some of those modifications that can make an already lethal weapon even more so:
Triggers
Upgraded triggers can be easily purchased online. Triggers that have less pounds of pressure are easier to squeeze, allowing a gunman to fire more rapidly and have a steadier hold on a weapon ― and thus make shots more accurate.
Flash Supressers
These devices, which are fitted onto the end of the barrel, help reduce the visible signature left behind when ignited gases exit the barrel.
High Capacity Magazines
While 30-round magazines are typically used by AR-15 owners, it’s possible to purchase stick magazines with 60- to 100-round capacities, as well as drum magazines, some of which can hold more than 100 bullets.
Cooling
AR-15′s tend to overheat quickly with continuous firing. However, there are ways to combat the speed in which the gun overheats. Some of those methods include swapping out the standard bolt carrier for one that can withstand repeated heat cycling, upgrading to a chrome-lined barrel and purchasing a hand-guard that can handle more intense heat and provide better ventilation. Still, the gun will eventually overheat,
Silencer
A silencer or sound suppressor, which reduces the noise emitted by a gun, can legally be purchased with little hassle in 42 states. While there are a few hoops to jump through, you can have one in less than a year. Silencers can also be fabricated, although doing so is illegal.
Gat Crank
That’s a simple bolt-on device, which allows the attached firearm to be fired by turning the crank. It is highly effective for rapid-fire. Federal officials only consider a gun automatic ― and thus illegal to own without government clearances ― if it can fire multiple rounds with a pull of the trigger. That definition allows such devices, which do not involve physically pulling the trigger, to skirt current regulations.
Conclusion
There are near infinite customizations and add-on components available for the AR-15, including optics, grips, anti-rotational pins, conversion kits, etc. You name it and chances are it’s available and there’s a how-to guide online.
Technology also has now made it easier than ever to forge both legal and illegal gun parts, as seen in this video by Wired: