This replacement or spare magazine is compatible with your Springfield Armory XD-S. It comes with a black sleeve to accommodate backstraps 1 & 2. (Backstraps not included)
Specifications:

Caliber	45 ACP
Capacity	6
Finish	Stainless
Model	XD-S
Material	Stainless Steel
Type	Detachable
Model Fit	XD-S
Brand Fit	Springfield
Max Capacity	6