A pen flare may be adapted for firing from a weapon having a caliber larger than a caliber of the pen flare. The adapted flare may be fired from a conventional shotgun. The adapted flare may include a pen flare with a portion having external threads and a base. The base may include an extractor rim and a through-bore with internal threads. The pen flare may be fixed in the through-bore of the base via the external and internal threads. A rear portion of the base may have an outer diameter that is greater than an outer diameter of a front portion of the base. A cylindrical sleeve may be disposed around the front portion of the base and around the pen flare. A conventional shotgun may be reversibly converted to a compact, lighter weight shotgun with a kit. The converted shotgun may be more desirable for firing flares.