<P> The Secret Service replaced the Thompson submachine gun with the Uzi submachine gun in the 1970s . Uzis that the Secret Service used have slightly shorter - than - standard barrels so they could to fit inside the standard size Samsonite briefcases that concealed them . They phased out the Uzi in the mid 1990s and replaced it with the H&K MP5 . The Secret Service was the last Federal agency to use the Uzi . </P> <P> The Counter-Assault Team used the M4 carbine from the early 1990s until 2006, when they replaced it with the SR - 15 carbine . </P> <P> The current sidearm for USSS agents is the SIG Sauer P229 chambered in . 357 SIG (which entered service in 1999) or FN Five - seveN chambered in FN 5.7 x28mm . </P> <P> Agents and officers are trained on standard shoulder weapons that include the FN P90 submachine gun, the 9mm Heckler & Koch MP5 submachine gun, and the 12 - gauge Remington 870 shotgun . The agency has initiated a procurement process to ultimately replace the MP5 with a 5.56 mm rifle HK416 . </P>

What kind of guns does the secret service carry