The stat card for Gheleon's Demise says 16 in a magazine without field scout but in game, the weapons has 15 shots. I'll post here on my continued findings.
EDIT: Field Scout increases the magazine to 27 like it states on the Stat Card and will increase the amount of ammo you can hold to 324
Fitted Stock does reduce recoil
Zen Moment decreases recoil by up to 15%
Firefly works
High Caliber Rounds works
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Happens with all scout rifles