Glock 20 or 21
 

Does anyone know if there are any companies that makes a Glock 20 or 21 or what the size differences is in the models. Is there any comparable models? I already have a holster (40QD32OD Blackhawk) I found some measurements but am still unsure how much of a difference it makes.

Glock 21 Weight: 26.28 oz (745g)
Length: 7.59" (193 mm)
Width: 1.27" (32 mm)
Barrel: 4.60" (117 mm)

Glock 17 Weight: 24.79 oz (703g)
Length: 7.32" (186 mm)
Barrel: 5.43" (138 mm)

Glock 18
Weight: 25.01 oz (709g)
Length: 7.32" (186 mm)
Width: 1.18" (30 mm)
Barrel: 4.49" (114 mm)

Is that the SERPA holster? If so, if it's made for a large-frame Glock, like the 17/22, then you should have no problem with the 20/21 and the smaller framed 19 fits as well.

Its the OMEGA VI Assault Airborne X2

It won't make difference. Any one of those guns will fit that holster.

Thanks for the help. I was worried I would have a useless holster.

What kind of holstor do you have?

Did you read the thread?