Alpha Wolf barrels establish the benchmark for absolute accuracy and combat reliability. It is the pinnacle of what every other barrel manufacturer strives to be. Other Features: Fits Glock 21 all generationsDesigned for lead, plated, or jacketed ammunitionCertified, stress relieved 416 stainless steelButton rifled, three stage honed boreIndustry recognized SBN premium coating (SBN is Salt Bath Nitride, similar to Tennifer)Heat treated to RC 40-42, then SBN coating increases surface hardness to RC 60Exacting tolerances allow for drop in installationFluting creates path for heat and debris to escapeThreaded models come with appropriate thread protector installed#html-body [data-pb-style="62DF8289732FE"]{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="62DF82897330B"]{border-style: none; border-width: 1px; border-radius: 0px; margin: 0px; padding: 0px;}