Forward Controls Design Ventilated Ejectable Chamber Flag Brass/Red. Machined from solid 360 brass a detachable and threaded accessory rod is a part of the VECF package a high vis chamber flag such as CFF (included) can be attached to VECF for increased visibility. The choice of material (360 brass) is a compromise between durability and preservation of user's equipment. VECF can be removed in 2 ways: 1. If the exgtractor has not engaged the VECF's rim pull the the charging handle back while using the chamber flag accessory rod as a handle to pulling out of the upper (do not use the chamber flag hamle to cycle the bolt). If the accessory rod isn't installed lift the muzzle and VECF will fall out of the chamber. 2. If the extractor has engaged the VECF's rim (it has a rim like a .223 round) pull back on the charging handle and VEC will be ejected like a spent/dummy round. NOTE: Do not use the small detachable threaded chamber flag rod to cycle the action. If the extractor has engaged the rim of VECF VECF can be ejected by using the charging handle. VECF is machined from brass. VECF's rim will eventually get worn by the extractor. Like an innert round VECF is a consumable because it will wear with use. CAUTION: VECF is designed to work with 5.56mm AR15/M16 only do not use it on AK pattern SIG 551/552/553 and 556 or other 223 auto loading rifles. It can work on 5.56mm bolt action rifles but VECF's length isn't compatible with many of them it'll work as a chamber flag but will not eject correctly. Specifications for Forward Controls Design Ventilated Ejectable Chamber Flag: Manufacturer: Forward Controls Design Color: Brass/Red Fabric/Material: Brass Caliber: 5.56x45mm NATO Gun Make: AR Platform Gun Model: M16 AR-15 Features of Forward Controls Design Ventilated Ejectable Chamber Flag Threaded post to attached chamber flag (CFF included) Ventilated for faster barrel cooling Package Contents: Forward Controls Design Ventilated Ejectable Chamber Flag CFF What firearm models does the manufacturer say Forward Controls Design Ventilated Ejectable Chamber Flag is compatible with? The manufacturer says that Forward Controls Design Ventilated Ejectable Chamber Flag is compatible with AR-15 M16Forward Controls Design VECF: Ventilated Ejectable Chamber Flag Brass/Red