will this fit a 1911 with rail?

Yes it will, I have a full size 1911 with rail and have no issues.

Will this fit a glock 20sf gen 4?

Yes, you should be able too get anything you want .

will it fit my sig p250 compact?

I dont think so, best way to check is to go onto blackhawks website and check through there, and possibly find the actual serial number for the holster, I remember seeing some sigs it'd got but I don't remember seeing a p250compact

They ask what size there is no reference next to the numbers they give what size do I need for a glock 17 and 20

your size is 0. That will fit glocks 17, 19, 20, 21, 22, 31 and 32. will also fit a M&P 9mm,40cal and 45. Make sure when you order you check right or left handed, unless you want one riding on each thigh, then order one of each.

Color	Coyote Tan
Size	Size 04 - Beretta 92/96/M9/M9A1 (Not Brigadier/Elite/92A1/96A1)
Hand orientation	Right
Style	Tactical
Compatible with	Pistol
Weight	822 g
Material type	Rubber
Seasons	all
Sport	hunting
Batteries included?	No
Brand	BLACKHAWK!
Department	Unisex
Manufacturer	BLACKHAWK
Item model number	430504CT-R
Product Dimensions	2.54 x 2.54 x 2.54 cm; 340.19 g
ASIN	B000MAWNSU

BLACKHAWK Serpa Level 2 Tactical Coyote Tan holster, Size 04, Right Hand, (Beretta 92/96/M9 Std or A1 w/rails (NOT Brig/Elite)

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