Another factor to consider is ammunition cost 9mm ammo, in some cases, is nearly half the cost of 5.56 ammo, and a fairly good assortment of 9mm can usually and easily be found in big-box stores as well as your local mom-and-pop gun store. That concept has been around since the days of the Old West because it made sense then and it makes sense today. What a 9mm AR really offers is a long gun and handgun that share the same ammo. If you can’t decide, there are plenty of kits that allow a user to adapt a 5.56 AR lower and put on a 9mm upper receiver and a drop-in magazine block to make the 5.56 magwell compatible with 9mm magazines. You pay a penalty for that ballistically, because there is a chasm between the 9mm pistol round and the 5.56 rifle round, which is why the Colt SMG was and is primarily used as an entry weapon to provide a high volume of firepower that can be effectively controlled. The 9mm produces nowhere near the muzzle blast. However, if you’re trying to decide on whether to add a 5.56 carbine or a 9mm carbine to your home-defense plans, the muzzle blast from the 5.56x45mm NATO causes some shooters to flinch. Load an AR chambered in 5.56x45mm NATO with the right bullets and you can control overpenetration, and, of course, the same can also be said with newer 9mm ammo. Today’s advances in ammunition technology has nearly made the overpenetration problem moot. Since military and LE agencies were familiar with the AR platform, it made sense to create a rifle that offered less penetration, less perceived recoil, less muzzle blast, and better short-range control.
Carbines chambered in 9mm with AR-15 controls have been around since the 1980s, when Colt developed the Colt SMG, a select-fire carbine.
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