AICS Compatible Mag Blocks / Empty Chamber Indicators ECI
Plugr
Vudoo Gun Works V-22 Empty Chamber Indicator –
DIY chamber flags. Got the idea to use nylon weed trimmer string and heat shrink tubing from another Redditor. Modeled and printed a few batches of these tags to go on them.
Chamber-View LLC
Hornady Rapid Rack Empty Chamber Indicator Flag AR-15 Rifle 223 Cal
Empty chamber indicators, four count, handgun
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Chamber-View® Empty Chamber Indicator - Rimfire