Made from 17-4 heat-treated stainless steel, these chokes are for shotguns using the Browning Invector Plus choke system. Steel, Lead, & Hevi-Shot may be used in all constrictions with the exceptions listed below: No Steel shot larger than #BB or speeds exceeding 1550 fps should be used in choke tubes tighter than full. No steel shot larger than #4 allowed in the Turkey constriction #html-body [data-pb-style="62DF828C5571B"]{justify-content: flex-start; display: flex; flex-direction: column; background-position: left top; background-size: cover; background-repeat: no-repeat; background-attachment: scroll; border-style: none; border-width: 1px; border-radius: 0px; margin: 0px 0px 10px; padding: 10px;}#html-body [data-pb-style="62DF828C55728"]{border-style: none; border-width: 1px; border-radius: 0px; margin: 0px; padding: 0px;}