Kak Ar15 Configurable Buffer Kit Kit Contains 1X Blasted Hard Black Anodized Buffer Body 3X Aluminum Weights 3X Steel Weights Black Oxide Coated 3X Tungsten Weights 4X Rubber Spacer Disks (1 Spare) 2X Buffer Bumpers (1 Spare) 2X Roll Pins (1 Spare) Great For Finicky Builds, 9Mm, Special Subsonic Work Etc Included Spare Parts -Rubber Spacer Disk -Different Colored Bumper (To Notate Configuration) -Roll Pin Keeps The System Going For Many Weight Swaps Buffer Colors May Vary, But You Will Receive 2 Different Colors Configure And Tune Your Buffer For You Specific Needs See Chart In Detailed Description Below Specifications for KAK AR-15 Configurable Buffer Kit: Manufacturer: KAK Industry Gun Model: AR-15 Condition: New Package Contents: KAK AR-15 Configurable Buffer Kit What firearm models does the manufacturer say KAK AR-15 Configurable Buffer Kit is compatible with? The manufacturer says that KAK AR-15 Configurable Buffer Kit is compatible with AR-15