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Fabrique Nationale (FN) replaced the white ring sight on the PS90 with a black ring sight.
The black ring sight is called the United States Secret Service Sight (USSS) or the USG sight. The black ring sight functions much better than the white ring sight in that you can see the black cross-hairs against white backgrounds; however, you cannot see the cross-hairs against black backgrounds or in low light conditions.The Rem-T3B solves this problem by illuminating the internal tritium sight.
The Pancor Corporation Jackhammer was a 12-gauge, gas-operated automatic shotgun designed in 1984 and patented in 1987. Only a few working prototypes of the Jackhammer were built. Nonetheless, its distinctive aesthetics and futuristic design have made it a prop in action films, television programs, and video games.
How to Make a Ghillie Suit