Faxon Firearms M16 Bolt Carrier Group BCG 5.56 TiN Red FF556BCGCNITRIDE-TiN. Faxon Firearms designed these Rifle Parts with bright solid colors that make organizing your mags easier than ever. With a red mag band for .300 Blackout a yellow mag band for 7.62x39 and a blue mag band for 5.56/.223 you'll never have to sift through your magazines again to find the right caliber. Faxon Firearms Magazine Cal. ID Marker Bands are made from rubber and come in packs of ten. Pick up some Faxon Firearms Magazine Caliber Identification Marker Bands to stay organized and ensure you always have the right ammo you need. Specifications for Faxon Firearms M16 5.56 Bolt Carrier Group: Manufacturer: Faxon Firearms Fabric/Material: Rubber Quantity: Pack of 10 Features of Faxon Firearms Magazine Marker Bands: Bright solid colors Package Contents: Faxon Firearms Magazine Marker Bands Faxon Firearms FX300MB: M16 Bolt Carrier Group BCG 5.56 TiN Red FF556BCGCNITRIDE-TiN