ERGO brings this receiver extension castle nut for M4 style receiver extension tubes.
Ergo Grip Castle Nut, Fits AR15/AR10, Steel, Black 4971-B
Ergonomic AR-15 Lower Spring Kit - 9 Piece Set
$6.25
Ergonomic AR-15 Enhanced Lower Parts Kit Without Fire Control Group with Black Grip
$95.00
Ergonomic Castle Nut for AR15 Black
$6.00
138 in stock
Ergonomic Castle Nut for AR15 Black
$6.00
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