Question: Who designed the guns used in the "Limited Class" and "Open Class" pistols offered by A & B?

Context paragraphs:
Blue Devils B Drum and Bugle Corps: The Blue Devils "B" Drum and Bugle Corps (also known as "BDB") is an Open Class competitive junior drum and bugle corps.  Based in Concord, California the corps is a member of Drum Corps International and has grown from a feeder corps for the World Class "(formerly Division I)" Blue Devils Drum and Bugle Corps, to a full-fledged Drum Corps in its own right.  The corps has won the DCI Open Class World Championship five times, having most recently claimed the title in 2016.

IBM Open Class: IBM Open Class (IOC) is an IBM C++ product originally developed by Kevin Leong and originally known under several names in the C++ industry, including ICL (IBM Class Library), UICL (User Interface Class Library), and OCL (Open Class Library).

Vanesca Nortan: Vanesca Nortan (born November 17, 1981 in Zaandam, Netherlands) is a Dutch karateka who won gold medals in the female kumite open class at the 2005 European Karate Championships and in the +68 kg weight class at the 2010 European Karate Championships.  Nortan also won a silver medal in the female kumite +60 kg weight class and won a bronze medal in the female kumite open class at the 2004 World Karate Championships.

Meteor-class aviso: The "Meteor" class was a pair of two avisos built by the Imperial German Navy in the late-1880s; the class comprised two ships, "Meteor" and "Comet" .  They were an improvement over the preceding "Wacht" class , being slightly faster and armed with quick-firing guns rather than the slower, old-pattern guns used on the earlier ships.  "Meteor" and "Comet" nevertheless proved to be disappointments, primarily a result of extreme vibration caused by their propulsion system, particularly at higher speeds.  As a result, their service careers were limited.  They served less than two years on active duty, from 1893 to 1895.  They returned to limited duty in 1904 as guard ships, but by 1911 they had been stricken from the naval register and used in subsidiary roles.  Both were scrapped in 1919–21.

Vanguard Cadets Drum and Bugle Corps: The Santa Clara Vanguard Cadets Drum and Bugle Corps, known as SCVC or simply as the Vanguard Cadets, is an Open Class competitive junior drum and bugle corps.  Based in Santa Clara, California, the corps is a member of Drum Corps International (DCI) and is the "B" corps of the World Class (formerly "Division I") Santa Clara Vanguard Drum and Bugle Corps.  On August 8, 2017, the Vanguard Cadets won their fifth DCI Open Class Championship title, also winning all caption awards.

Southwind Drum and Bugle Corps: Southwind Drum and Bugle Corps is an Open Class competitive junior drum and bugle corps based in Mobile, Alabama.  The corps was a Division I (now World Class) competitive junior drum and bugle corps in Drum Corps International (DCI) from 1993 through 2007.  Prior to competing in Division I, Southwind competed in DCI's Class A/Division II and was that division's World Champion in 1991 and 1992.  Southwind performed at competitive and non-competitive SoundSport events in Alabama and surrounding states during the summer of 2014.  In early May 2015, DCI approved Southwind's return as an active Open Class corps.

A &amp; B High Performance Firearms: A & B High Performance Firearms was a competition pistol manufacturer.  Products included the "Limited Class" and "Open Class" semi-automatic pistols, both available in .40 S&W and .45 ACP.  A & B sold directly to consumers.

.45 ACP: The .45 ACP (Automatic Colt Pistol), or .45 Auto (11.43×23mm) is a handgun cartridge designed by John Browning in 1905, for use in his prototype Colt semi-automatic pistol.  After successful military trials it was adopted, along with the Browning .45 Colt handgun, as the .45 M1911 cartridge.  The handgun was designated M1911 pistol.

16&quot;/45 caliber Mark 6 gun: The 16"/45 caliber Mark 6 gun is a naval gun designed in 1936 by the United States Navy for their Treaty battleships.  It was first introduced in 1941 aboard their "North Carolina"-class battleship s, replacing the originally intended 14"/50 caliber Mark B guns and was also used for the follow-up "South Dakota" class.  These battleships carried nine guns in three three-gun turrets.  The gun was an improvement to the 16"/45 caliber guns used aboard the "Colorado" class , and the predecessor to the 16"/50 caliber Mark 7 gun used aboard the "Iowa" class .

Drum Corps Associates Open Class World Champions: During Labor Day Weekend, Drum Corps Associates (DCA) Open Class corps compete to earn the title of DCA Open Class World Champion.  The championships consist of 2 rounds (Prelims and Finals) held on 2 consecutive nights (the Saturday and Sunday nights of Labor Day weekend).  All corps compete at Prelims, with the top 10 Open Class and top 4 Class A corps competing at Finals.  The champion is determined by the overall high score in the Finals competition.  There are also a number of "caption" awards (high brass, high percussion, high visual, etc.), though the process of determination for those awards has changed from year to year.

Supporting paragraphs: A &amp; B High Performance Firearms .45 ACP
Answer: John Browning