Question: The Bushmaster XM-15 series (formerly styled as XM15) is a line of AR-15-pattern semi-automatic rifles, carbines, and pistols manufactured by Bushmaster Firearms International, LLC, based in Madison, North Carolina, in which country?

Context paragraphs:
Bushmaster XM-15: The Bushmaster XM-15 series (formerly styled as XM15) is a line of AR-15-pattern semi-automatic rifles, carbines, and pistols manufactured by Bushmaster Firearms International.  Variants include the Bushmaster M4-type Carbine, Patrolman series, QRC series, Bushmaster XM15-E2S and the Carbon 15 line.

Bushmaster M4-type Carbine: The Bushmaster M4 is a semi-automatic or select-fire carbine manufactured by Bushmaster Firearms International, modeled on the AR-15.  It is one of the Bushmaster XM15 line of rifles and carbines.

.450 Bushmaster: The .450 Bushmaster is a rifle cartridge developed by Tim LeGendre of LeMag Firearms, and licensed to Bushmaster Firearms International.  The .450 Bushmaster is designed to be used in the standard M16s and AR-15s, using modified magazines and upper receiver assemblies.

Kel-Tec SU-16: SU-16 refers to a series of semi-automatic rifles and carbines manufactured by Kel-Tec CNC Industries, Inc. of Cocoa, Florida, referred to in Kel-Tec's marketing as "Sport Utility rifles".  The SU-16 series is notable for its compact, lightweight and simple design; and for being able to be broken down and folded into a compact configuration for transportation and storage.  While the barrel, bolt-carrier and mechanism are steel, the SU-16's stock, receiver, and forend are manufactured of high-strength polymer plastic.

Smuggling of firearms into Mexico: Mexicans have a right to own firearms, but legal purchase from the single Mexican gun shop in Mexico City, controlled by the Army, is extremely difficult.  Guns smuggled into Mexico are sometimes obtained at gunshops in the United States and carried across the US-Mexico border.  In other cases the guns are obtained through Guatemalan borders or stolen from the police or military.  Consequently, black market firearms are widely available.  Many firearms are acquired in the U.S. by women with no criminal history, who transfer their purchases to smugglers through relatives, boyfriends and acquaintances and then smuggled to Mexico a few at a time.  The most common smuggled firearms include AR-15 and AK-47 type rifles, and FN 5.7 caliber semi-automatic pistols.  Many firearms are purchased in the United States in a semi-automatic configuration before being converted to fire as select fire machine guns.  Mexico seized in 2009 a combined total of more than 4,400 firearms of the AK-47 and AR-15 type, and 30% of AK-47 type rifles seized have been modified to select fire weapons, effectively creating assault rifles.

Bushmaster Firearms International: Bushmaster Firearms International, LLC, based in Madison, North Carolina, United States, is a manufacturer and distributor of firearms.  The company's product line revolves around semi-automatic pistol and rifle variants of the M4 / AR-15 design.

Bushmaster M17S: The Bushmaster M17S is a semi-automatic bullpup rifle that was manufactured by Bushmaster Firearms International from 1992 until 2005.

Carbon 15: The Carbon 15 is a family of lightweight, magazine-fed pistols, carbines, and rifles developed by defunct United States weapons manufacturer Professional Ordnance, with the design picked up after some time by current manufacturer Bushmaster Firearms.

Kel-Tec: Kel-Tec CNC Industries Inc. is an American developer and manufacturer of firearms.  Founded in 1991 and based in Cocoa, Florida, the company has manufactured firearms since 1995, starting with semi-automatic pistols and expanding to rifles and then shotguns. Kel-Tec is a privately owned Florida corporation.  George Kellgren is the owner and Chief Engineer.  He is a Swedish designer who also designed many earlier Husqvarna, Swedish Interdynamics AB (in Sweden), Intratec and Grendel brand firearms.  The company has been developing and manufacturing a wide variety of firearms, ranging from automatic handguns i.e. pistols to automatic rifles and shotguns.

Saiga semi-automatic rifle: The Saiga semi-automatic rifles (/ˈsaɪɡə/, Saiga) are a family of Russian semi-automatic rifles manufactured by Kalashnikov Concern (formerly Izhmash), which also manufactures the original AK-47 and its variants, Saiga-12 shotguns and Dragunov sniper rifle.  Saiga rifles are a sport version of the AK-series rifles, and are marketed for hunting and civilian use.  They are sometimes referred to as "Saiga Sporters".

Supporting paragraphs: Bushmaster XM-15 Bushmaster Firearms International
Answer: United States