Mech-Tech Systems now makes a Pistol Conversion Unit for XD/XDM, Glock, and 1911 pistols, in calibers up to .45 Super and .460 Rowland in the 1911 version, and 10mm Auto in the other two. The Pistol Conversion Unit (PCU) utilizes a 12" barrel and an arm brace maintaining its status as a pistol accessory. On sale now until NOV 15, $35 off any CCU or PCU.
ETA: The PCU is available in FDE finish for $49.95 extra. A threaded barrel is also an extra $49.95. A 12" suppressed .45 ACP PCU may be in my future if I ever get an inheritance. My mom is 98 years old but may be immortal, so I'm not expecting anything soon.
https://mechtechsys.com/