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THE GALCO S.O.B. AND THE FOBUS LEATHER PANCAKE MADE FOR THE GLOCK MODEL 21 WILL ALSO FIT THE 21SF
a good custom leather holster is great but BlackHawk! serpa line may have one.
This website has what you need for you question. http://www.blackhawk.com/product/Sportster-SERPA-Holster,1146,1410.htm
If you mean the Galco model M7X224, no. That fits the Glock 17, 22, 31. You might try Galco customer service at 1(800) USGALCO (874-2526)
any small umerax or crossman holster
Many holster makers have one or more types that will fit.
I'm going to guess that you're referring to an inside the waistband holster and an outside the waistband holster. An inside the waistband holster literally fits inside the waistband of your pants, and a outside the waistband holster fits on the outside of the pants, either using a belt or a paddle. The IWB is normally more concealable because it holds the gun much closer to your body, however, many people consider the IWB to be less comfortable.
A Browning Hi Power
Whichever model fits your intended use and budget.
Try some that fit the Walther PP
Any one that fits a S&W K frame
Hunter Holster 1100 is not a model. It's a "series". The model number is usually the 1100 followed by a 2 digit number. Example "1100-50" fits 7-1/2" Barrel Freedom Arms Model 353, 455, Ruger Blackhawk, Super Blackhawk, Redhawk, Super Redhawk Double check the holster. Usually it's branded with the full model number.