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For all calibers – Gen 1 or Gen 2 – Marauder rifles


Direct replacement o-rings for the fill adapter housing, gauge port, and valve assembly.

Buna-N A70  Black. 

Works with the buffer mod too.


*Click on the following link to add silicone to your order:




Package includes:  5- o-rings, paypal fees, and shipping within the USA

Price: $6.98