What's gun barrel cleaners ? World' s fastest gun barrel cleaner , cleans gun barrels in 10 seconds , we manage about 20 kinds of gun barrel cleaners now, they are : G01 : 12 ga gauge, g02 : .22 cal .223 cal & 5.56mm, g03 : .38 cal .357 cal .380 cal & 9mm, g04 : .30 cal .308 30-06 .300 .303 & 7.62mm, g05 : .17 cal 17hmr .177, g06 : .416 cal .44 45-70 .458 .460 cal, g07 : 20 ga gauge, g08 : .270 cal .280 .284 & 7mm, g09 : .44 cal .45 cal, g10 : .243 cal & 6mm, g11 : .35 cal .350 .357 .358 .375 cal, g12 : 410 ga gauge, g13 : .32 cal & 8mm, g14 : .338 cal .340, g15 : 16 ga gauge, g16 : .25 cal .264 & 6.5mm , g17 : .40 cal .41 cal , g18 : .50 cal .54 cal , g19 : 10 ga gauge , g20 : 28 ga gauge , how to use a gun barrel cleaner ? Drop brass weighted cord through the barrel. Pull slowly, being careful not to snag on edges or gun parts. Repeat as needed until gun barrel is clean. The gun barrel can be washed easily by hands. Band securely or use a was bag for machine cleaning. Air dry. Attention : Be sure firearm is no-uploaded before cleanup , verify your gun barrel is free of obstructions after use of this product , and before firing. Keep this product out of reach of children , use the gun barrel cleaners only on recommended calibers , .