Soldier Synchronization
Feat 4
Source Tech Core pg. 65
Archetypes
Grenadier
You count grenades as an area weapon with the area (burst) trait for the purposes of all soldier feats and class features, including primary target and suppressing fire. If you're holding a grenade, you meet the requirements for soldier feats that require you to wield an area weapon.
When you use primary target with a grenade, the grenade counts as a simple thrown weapon with expend 0, the area (burst) trait, and a range of 70 feet (or 140 feet if you have the Long Thrower feat). The Strike against the grenade's primary target deals one damage die of the same dice size and damage type dealt by the grenade. This damage increases to two damage dice if the grenade is advanced or superior, to three damage dice if the grenade is elite or ultimate, or to four damage dice if the grenade is paragon. If the grenade doesn't usually deal damage, it doesn't deal damage using primary target.
When you use primary target with a grenade, the grenade counts as a simple thrown weapon with expend 0, the area (burst) trait, and a range of 70 feet (or 140 feet if you have the Long Thrower feat). The Strike against the grenade's primary target deals one damage die of the same dice size and damage type dealt by the grenade. This damage increases to two damage dice if the grenade is advanced or superior, to three damage dice if the grenade is elite or ultimate, or to four damage dice if the grenade is paragon. If the grenade doesn't usually deal damage, it doesn't deal damage using primary target.