Engle's Spring Gun?

This is a recent find. They are for a Engle’s spring gun. Is the term spring gun just another name for a BB gun or pellet gun? The bag has a date that I think reads as “Jan. 19, '86”. Much of the printing on the bag is not readable but I think it is a “P.A.” address. I would like any info I can get on this item.

These projectiles were made for a single shot model of the Engle’s spring gun designed by Stephen D. Engle and manufactured by the Engle’s Spring Gun Company in Hazleton, PA (the patent mentioned in the bag was actually for a repeating magazine model firing round balls). Here is an advertisement published in 1888:

This company also made other interesting inventions…

Wow! Thanks Fede.