Fostech Echo-II Drop In Trigger For AR-15 Platform Rifles - Gen II - Patented Fast Fire Trigger System by Fostech... ATF Approved
Fostech Echo-II Drop In Trigger For AR-15 Platform Rifles - Gen II - Pat…
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classicfirearms.com
Fostech Echo Sport Trigger Fast Fire Binary Trigger System For AR-15 Platform Rifles, Safe, Semi, and Echo Firing Modes - Model 4140
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