A simple adapter kit is all it takes to convert a Mossberg 500 or Maverick 88 pump-action shotgun to accept the company’s FLEX-series accessories. The FLEX system, comprised of 16 available components, allows users to quickly change the stock, recoil pad and fore-end—whether setting up a Mossberg shotgun for a small-frame shooter, preparing for home defense or getting ready for a late-season goose hunt, the system is flexible. The conversion kit provides an adapter that fits within the receiver’s rear and a replacement slide assembly for FLEX fore-ends. FLEX fore-ends, stocks and accessories are sold separately. Price: $80. Contact: O.F. Mossberg & Sons; (800) 363-3555; mossberg.com.