Qp firearms are usually the same exact guns but they are released discounted by the manufacturer, for the purpose of being sold to public, servants LEO, Military etc as a thanks for their service.
"Who qualifies for the Qualified Professional Discount?
Many major manufacturers offer discounts to a large list of individuals they consider Qualified Professionals. Although commonly referred to as Law Enforcement, LE or Veterans Discounts, these discounts are actually also available to many other types of Qualified Professionals, including :
Active, Honorably Discharged or Retired Military personnel - all branches (veterans, including medical discharges/disabled)
National Guard personnel - all branches
Military Reserve personnel - all branches
CAP - Civil Air Patrol
Fire Fighters - including volunteers
Paramedics and EMTs
TSA Employees
Commercial Pilots
Federal Flight Deck Officers
Air Marshals
Court Judges
District and Deputy District Attorneys
All sworn or retired Law Enforcement Officers - city, county, state, and federal
All Corrections and Probation Officers
State Licensed Security Companies
State, Federal, and Private Security Guards
DOD Contractors
What to Submit :
A current and complete (front and back) copy of your official identification. If you cannot send official identification, we accept LES forms or department letterheads stating employment. Please also include your driver's license if you use one of these two methods."

Robert, it is a Manufacturer designated firearms package that is to be sold specifically to First Responders at a discount. There is zero difference in the actual firearm but many PRO packages do come with extra accessories as well such as holsters or extra magazines. Buds QP categories are here : budsgunshop.com/index.php/cPath/1799/Qualified+Professional+Discounts

It's the price that is for qualified professionals only. Many manufacturers offer special discounted pricing for those working in law enforcement.

It is just priced differently for the discount: budsgunshop.com/qualified_professional_discounts.php If you search the same model number but without the LE on the end (most of them are this way, not sure which you are looking at in particular) you should be able to find the same thing available for purchase for anyone.