PEQ and DBAL Boxes in airsoft accomplish different purposes. First they are used as battey compartments for compact AEGs that do not have internal battery compartments. Second ass laser and light aiming devices. Third do all at the same time. But which one is best for airsoft? Here is 0'20 Magazine giving their take on these two:

C.J. "Typhon" Hayes shows your the G&P DBAL IR Illuminator available right now at Airsoft Outlet Northwest... "The G&P DBAL-A2 or DBAL I2 (GP-LS-959) is a reproduction DBAL style Laser Illuminator and Laser Designator. This unit features a visible red laser, as well as an IR laser and IR illuminator. The G&P DBAL is constructed with an aluminum housing and shrouded finger adjustable zero knobs for both lasers.

TAF are now selling the Target-One DBAL-PL Dual Beam Aiming Laser Pistol Light at the Rakuten Taiwan online store... "This light moduel with compact configuration of the various purposes and ismade ​​of reinforced plastic shell production. It has a built-in white LED light and Infrared Lighting that can be used in dark conditions and can work with night vision equipment.

Now in stock at JK Army is the Element DBAL eMK II I-Red Flashlight and Laser which is a... "Multi function dual beam, IR/Daytime visible and Integrated with LED Flashlight and IR illuminator. It has a Button & Wire Remote Control Switch which works with Selector Switch Fits for standard 20mm Rail. You can install EX 201 MRDS on it (EX 201 not included).