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OPS INC M4-S
$275.00
4.5" OAL, 11oz extends 1" past mount. total OAL installed on 7.5" barrel = 10" This suppressor shares the same mounting point as the 14th, 16th, and 15th model suppressors. 
This is designed to take the edge off SBR and mask shots on longer barrels. 
The mount and collar are NOT included.

The M4-S was designed for professional end users who have a need for reduced noise, concussion with the added benefit of increased back pressure. Unlike the Krinkov style muzzle devices, the M4-S offers a double db reduction, while keeping the OAL and weight to a minimum. Also unlike the Krinkov devices the M4-S creates enough back pressure that a much smaller gas port can be used on the short barrels while increasing reliability