Phantom Defense Subsonic Maker Solid Copper Expander 7.62x51 190gr NAS3 Rifle Ammo - 20 Rounds - Meet the next generation of micro handguns from Smith & Wesson: the Bodyguard 2.0. Compact and lightweight, it's built to deliver outstanding performance without compromise. An updated ergonomic design improves control, while the striker-fired flat-face trigger enhances accuracy. With a reversible magazine release and increased capacity, the Bodyguard 2.0 is designed to adapt seamlessly to your needs. copper bullet is designed to expand consistently at subsonic velocities; Designed for optimal performance in both suppressed and unsuppressed bolt action platforms; subsonic; Usage Recommendations: To maintain stability and prevent tumbling, this round is optimized for rifles with a 1:10 twist or faster. Phantom recommend confirming stability before using with a suppressor. Always test fire without the suppressor first to ensure the projectile is stabilized and isn't tumbling at your desired distance. Be sure to check with your suppressor manufacturer to confirm compatibility with your specific setup. The subsonic .308/7.62x51 ammunition is specifically tested and optimized for subsonic velocities using a bolt-action rifle. Please note that this round may not reliably cycle in most semi-automatic firearms without significant tuning or potential modifications to the firearm.