THE GALCO S.O.B. AND THE FOBUS LEATHER PANCAKE MADE FOR THE GLOCK MODEL 21 WILL ALSO FIT THE 21SF
SF = "Short Frame" The short frame was originally designed to compete in the U.S. military Joint Combat Pistol trials for a new .45 ACP pistol to replace the M9 pistol. This was achieved by a reduction in trigger reach and a reduction in heel depth.
Both. .45 Auto and .45 ACP are the same round.
a good custom leather holster is great but BlackHawk! serpa line may have one.
IF truly NIB, 550 USD
This website has what you need for you question. http://www.blackhawk.com/product/Sportster-SERPA-Holster,1146,1410.htm
In what condition? Used and abused? $300-$375. Depending on your area. New? $500+. Again depending on your area. Typically $400-$500
No
Glock Ges.m.b.H. was created on 2010-03-21.
The glock 21 fires the .45 automatic colt pistol (.45acp, or .45 auto) round.
The Glock 21 does fire the .45 ACP, as does the Glock 30. You're probably thinking of the Glock 37, 38, and 39, which fire the .45 GAP cartridge - those cannot fire a .45 ACP.
Check your owner's manual or call Glock.