This video details a modification made to a Deep Fire AT4 40mm launcher, converting its bore from 57mm (2.25 inches) to 38mm (1.5 inches). The primary goal of this modification was to enable the use of Milsim Labs M29 40mm foam rounds. The presenter highlights significant performance improvements, including increased range and accuracy, achieved through the optimized barrel system. Before the modification, a 60mm round achieved a 200-foot range with 15-20 feet of target zone at 30 degrees elevation. Post-modification, the launcher achieves 225-foot accuracy with a vehicle-sized target at only 10 degrees elevation, and can reach over 300 feet with 30 degrees of elevation.
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