Let me enlighten you.
I don't own a Stinger but I've read so much about them that I can literally dream the specs and features.
First, there is the 'standard' Stinger.
As you can see, it has a pushbutton on the head and is made of aluminum.
It also has a spare lamp storage inside the tailcap.
Then there's the Stinger XT, a 'tactical' version of the regular Stinger.
It has a tailcap switch (clickie), aluminum body and a non-slip rubber grip.
No spare lamp storage because of the switch.
The PolyStinger...
...is a polymer version of the regular Stinger (hence the word Poly).
It also has a pushbutton on the head and spare lamp storage inside the tailcap.
Each type of Stinger has a Lexan lens and adjustable focus.
The HP or High Performance reflector...
...basically replaces the standard head on the Stinger and Stinger XT...
...and offers a tighter, furthing reaching beam.
Because the lamp of the HP head is larger, it can not be stored inside the tailcap.
Did this help?
Greetings,
Velcro