CPT Nervous
Grandmaster
There is no age limit or LTCH requirement to put a pistol grip on a shotgun. You must be 21 to buy a shotgun with a pistol grip, not to possess one. Many Mossbergs are sold with a standard stock, and include a pistol grip in the box.
You can buy one of these at 18, go home, and put on the grip. However, it would not be possible to buy it in that configuration. It is considered a handgun by IN law. You can own/possess/carry a handgun at 18, but you cannot buy one.
You can buy one of these at 18, go home, and put on the grip. However, it would not be possible to buy it in that configuration. It is considered a handgun by IN law. You can own/possess/carry a handgun at 18, but you cannot buy one.