BudsGunShop.com - Differance in models.

The 30S has the thinner slide that the Glock 36 uses, the 30SF has the normal thicker 30 slide.

The SF model reduces the circumference of the receiver at the rear, or "back strap," offering increased comfort and control, especially for shooters with smaller hands

John, SF = Short Frame which has a smaller diameter Grip Handle to accommodate smaller hands and also allow for a better ergonomic fit for more hand sizes. Cheers and stay safe!

The SF model reduces the circumference of the receiver at the rear, or "back strap," offering increased comfort and control, especially for shooters with smaller hands