wonderful......pity browning didnt supply them with the early BOSS systems.... pretty sure the interaction with one of those started the tinitus ringing for me. they later supplied non ported ones....I recal trying coke can and insulation tape to one in .30/06 on range in PLPT to try and tame it....it simply blew it apart...we made fella shoot alone while we all retreated with earmuffs ...man that was LOUD.
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