Abstract: An inexpensive injection device is provided which is manufactured of plastic components, and is adapted to fit various syringe sizes. The injection device is spring loaded, and provides a firing barrel which, in the cocked position, is offset slightly from the central bore of the device.When the device is fired, the firing barrel is aligned with the central bore and projects the needle portion of the syringe into the user.For obtaining blood samples, the syringe is replaced by a striker element, which actuates a spring loaded puncture module which punctures the skin and is quickly withdrawn.