Has anyone tried this with a 12 gauge automatic shot gun and if so how does the recoil effect the mounting and the light?

I have mine mounted to an XD .40 service model and the one major draw back to this product is the pin that holds the quick release lever. After about 350 rounds through the weapon w/ the light attached the pin began to back itself out. It's a quick fix with a spring pin but it is something to keep an eye on. Hope this helps.

is there any estimate of "constant on" battery life?

W, I own 2 of these- although mine are Nebo Pro-Tec tac lights- they are the same light with the same battery and mount.In my experience, after accidentally leaving one on, it was just as bright after about 45 min. I had replaced the original battery with a new generic alkaline about a week previous. I think that's pretty good, and I do carry extra batteries inside the foregrip of my 9mm AR. Hope this helps. I should send you a photo of it

Special Feature	Durable
Power Source	Battery Powered
Light Source Type	LED
Material	Aluminum
White Brightness	500 Lumens
Included Components	Battery
Product Dimensions	3"D x 1.12"W x 1.18"H
Voltage	3 Volts
Battery Cell Composition	Lithium
Item Weight	3 ounces
Number of Batteries	1 CR123A batteries required. (included)
Water Resistance Level	Water Resistant
Warranty Type	Full Warranty
Brand	Aimkon
Brightness	500
Battery Description	CR123A Lithium
Light Source Wattage	0.3 Watts
Mounting Type	Weaver Mount
Global Trade Identification Number	00023525758997
Manufacturer	HiLight
UPC	023525758997
Part Number	P10S
Item model number	HiLight P10S
Batteries	1 CR123A batteries required. (included)
Is Discontinued By Manufacturer	No
Shape	Compact
Item Package Quantity	1
Special Features	Durable
Batteries Included?	Yes
Batteries Required?	Yes
Description Pile	CR123A Lithium
Warranty Description	1 year warranty.

HiLight P10S 500 Lumen Pistol LED Strobe Flashlight with Weaver Quick Release for Glock Series, Sig Sauer, Smith & Wesson, Springfield, Beretta, Ruger, and Heckler & Koch, etc.

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