7.62 x 51mm / .308 Win caliber; Impact resistant polymer body; Insert molded stainless front guard, wear-resistant for high volume shooting; Stainless rear feed lip provides a durable stable platform for feeding; Available with translucent or opaque body; Straight internal geometry with a controlled tilt follower; Stainless steel spring; Slide on bottom with a switchable drain; Aggressive texture to improve gripping and retrieval from pouches; Clear Finish