Reddit member Tavarish has compiled a list of screenshots with information pertaining to Battlefield 4's shotguns. He compiled the screenshots based on LevelCap's latest video.
Keep in mind that the information accumulated is incomplete, and lacks, for example, detailed information about the 12G Dart (Flechette ammo), sights, and accessory modifications for each weapon.
The descriptions of the various ammunition types and barrel modifications for the guns are as follows.
Full Choke
Significantly tightens the shot spread for improved Accuracy, but has penalties for Stability and Hip Fire as well. Not recommended with Slugs.
Modified Choke
Moderately tightens the shot spread for improved Accuracy, but has penalties for Stability and Hip Fire as well. Not recommended with Slugs.
Duckbill
Flattens the normal spread of pellets horizontally, making shot spread in a flat line towards targets.
12G Buckshot
A swarm of deadly pellets best used against a single unarmored target at close range.
12G Slug
Plastic saboted slug designed to engage the rifling in the shotgun barrel. Provides increased Accuracy and vastly improved Range by the use of a single…
12G Frag
12 gauge explosive Frag ammunition for increased suppressing power.