That product was marketed and sold during the mid-90s. it is a very simple design that uses the momentary, non-clickie tailcap. It used the original 6P body plus another 6P body in tandem to allow the long, NiCad battery pack to be housed.
The P60 drop-in lamp assembly uses the xenon lamp and the smooth, mirrored reflector before Surefire moved to using the stipled, "orange-peel" model for which it pioneered in this form factor to obtain the artifact-free projected spot (commonly refered to as the "beam").
This configuration made for a rather long, duty-length flashlight that uniformed LEOs found to be baton-esque that worked to their avantage as an implement to control arrestees. The NiCad pack's weight added welcomed heft when this product was deployed as such; however, it made for cumbersome, tiring carry reminescent of the Maglite 2C to which it proximated in weight and dimension except for the 2C's rather bulbous reflector housing.
Output-wise the 6R's was nothing short of amazing when compared to the duty offerings of LE department issue incumbents such as those from Maglite and Streamlight; however, the P60 lamp assembly was rather power-hungry and required officers for carry 2-3 spares batteries per shift. Moreover, the old NiCad technology battery pack's voltage quickly depleted and made for a rather flaccid, yellowed "beam" after just 15 minutes of continued usage. Officers would quickly replace the battery pack to try to get that "white beam" once again; however, they quickly found that if the battery packs were not freshly charged just before the shift, likely sitting idle for several days, it would give them no better output than that which they were replacing.
Overall, this configuration was not an efficient option for the LEO whom needed a duty light that would endure an entire 8-10 hour shift. While it was not dimensionally-overbearing, it required more battery packs. While its output was superior in the smaller overall package, it did not last long. Many officers returned to the use of the other rechargeable duty lights from the other makers, and sought the much more efficient CR123-powered P60 lamp housed in the half-as-long 6P body as back-up. When certain LE departments began providing CR123s in conjunction with training for the Harries and Rogers shooting technique, many uniformed LEOs quickly avoided usage of the large, heavier lights. Soon, the 6P found it way in the pockets of detectives and off-duty uniformed officers and the 6R's demand rapidly lost its appeal until its 8X, 9X, 8NX, 9Nx iteration appeared along with better NiCad technology.