SureFire G2 Nitrolon
Produced by Surefire
 

The SureFire G2 is one of the smallest 2 123A cell flashlights available.  It comes in Black, OD-Green & Yellow.
The SureFire G2 comes with 2 SureFire (SF123A) Lithium batteries and a 65 lumen (P60) lamp assembly.
SureFire products are very high quality and come with a Lifetime "If it breaks, we fix it" warranty.
This model is the composite nitrolon version.  It is very strong and lighter (3 oz) than comparable models.
The durability of nitrolon may actually exceed that of aluminum.  The bezel has a lexan lens.
The G2 has a push button momentary switch.  For constant "on" twist the tail cap clockwise.
 
 

There are 2 lamp assemblies available for the G2:
P60 65 lumens for 60 minutes of battery life. (included)
P61 120 lumens for 20 minutes of battery life. (available separately)
There is also a rechargeable upgrade kit available for the G2.  It extends
the length of the G2 and allows it to work with rechargeable batteries.
 

Here is a size comparison between the G2, L4 and the Arc AAA.
The L4 is noticeably thinner and just slightly longer than the G2.
 
 

This version is a "CPF 50 Special".  It was a limited run of 50 G2's sold
exclusively to CandlePowerForums members.
 
 

This is a comparison shot between the E2 with the MN03 @ 60 lumens
and the G2 @ 65 lumens.  The G2 has a slightly oval, tighter beam and brighter hotspot.
 

Here's the Surefire G2 against the Surefire A2.  Not much difference.  The A2 is a bit whiter.
 

Outdoor Beamshot Comparisons: