Leapers UTG Quick Install AR-15/M4 replacement dust cover kit for.223″5.56 caliber rifles and pistols because it of its tool-free design. This Leapers UTG AR-15 Dust Cover quickly installs without removing your handguard and it is compatible with all.223/5.56 Mil-spec rifles and pistols, and most billet upper receivers. The dust cover is made from strong matte black impact and heat resistant polymer construction with Steel Spring-loaded Detent to cut down on weight.