|Date of first acceptance||July 2006||Total acceptances||142|
|Manufacturer||GM GDLS Defense Group, L.L.C.||Crew||
|Type||Mount||Ammunition||Traverse||Max traverse rate||Elevation|
|105mm Gun M68A1E8||Turret||18 rounds||360°
|45°/sec||+15° to -5°
|7.62mm M240C MG||Coaxial to 105mm gun||3,400 rounds
|45°/sec||+15° to -5°
|.50cal M2HB MG||Flexible on turret skate mount||400 rounds||Manual||--||Manual|
|Azimuth and elevation|
|Thermal for gunner, thermal panoramic viewer commander, AN/VAS-5 thermal for driver|
|High hard steel structure|
|Engine||Caterpillar 3126; 6-cylinder, 4-cycle inline turbocharged diesel|
|Transmission||Allison MD 3066P, 6 speeds forward, 1 reverse|
|Steering||Hydraulic, steering wheel|
|Brakes||Dual-circuit hydraulic with air-power assist; anti-lock system on rear 3 axles|
|Type||Road wheels||Shock absorbers|
|Hydropneumatic||4/side||On each wheel|
|Max level road speed||60mph
|Max grade||60%||Max sideslope||30%|
|Max vertical obstacle||23"
|Min turning diameter||52'
|Max fording depth||66.9"
|Cruising range||~300mi, roads
The Stryker mobile gun system was designed to give direct-fire support to Stryker brigade combat teams, and it shares nearly 70% parts commonality with the Stryker ICV on which it is based. The gun is a version of the 105mm gun M68 found in tanks such as the M60 and M1 Abrams, and it is mounted upside-down in a low-profile turret with the commander and gunner seated to each side of the ordnance. Either man can operate the turret and weapons. All eighteen 105mm rounds are contained in an automatic loader capable of a six round/minute sustained rate of fire, with eight rounds in a turret ready carousel between the gunner and commander and ten in a replenisher magazine in the hull rear. Replenishment of the turret carousel is an automated process, but in an emergency the gun can be manually loaded from inside the vehicle via a small hatch. The vehicle's hydropneumatic recoil system allows the gun to be fired at any position relative to the hull. Early vehicles featured two four-barreled M6 66mm smoke grenade launchers on each side on the main gun and a swing arm mount for the .50cal machine gun, but later vehicles have the commander's MG mounted on a skate rail and only a single smoke grenade launcher on his side. The base armor can be supplemented, and slat armor can be mounted to help deal with antitank rockets, especially.
The M1128 was not modified with the double-V hull configuration, but Stryker A1 upgrades were instituted beginning in 2018. These included a 450hp engine; 60,000lb (27,000kg) suspension; 910-amp alternator; and an in-vehicle network.