Brass catcher for upper receivers with charging handles on ejection port side.
POTD: Railed AR-15 Upper -The Firearm Blog
Why Side-Charge Your AR-15? - The Shooter's Log
Brass catcher for side charger upper receivers
Brass catcher for side charger upper receivers
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Brass catcher for side charger upper receivers
AR15/AR10 Brass Catcher - Operator STD
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Caldwell rail mount brass catcher - side charge mod - Modern Sporting Rifle Evolution
AR 15 CMT UPUR-3A Billet Upper ( Side and Rear Charged)