The gear
Pistol caliber carbine comes down to capacity. Fewer reloads means fewer places to lose time.
Taylor Freelance
Taylor Freelance lists the Goliath +20 as taking a Glock magazine to 51 plus 1 in a pistol caliber carbine. Aluminum body with a quick release base, so it comes apart for cleaning without a fight. Available in shiny, red, blue, or black.
Taylor Freelance
The bigger brother. Taylor Freelance built the Goliath XL for outlaw matches that run 40, 50, and 60 shot courses of fire, where reloading is the whole problem. Aluminum, same color options, $119.99.
Taylor Freelance
Taylor Freelance makes the basepad and extension parts for JP magazines, out of Bellingham, Washington. Their whole catalogue runs on one idea, and they print it on the site: more ammo is always better.