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Thanks everyone. I will be traveling through Maryland. I am going to be sure that I don't have to stop at all.
I did not think to look there. What section are you talking about? I did see where it talks about SBR's and SBS's, but nothing about suppressors.
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I think that is the point he is trying to make. SBRs, SBS, MGs, and DDs require prior approval. AOWs and silencers are not mentioned in the instructions of the 5320.20. This is because the regulations do not require prior approval.
ATF Martinsburg will be happy to approve a 5320.20 if you submit it. My silencers hang on the front of SBRs, so it is simple for me to put the SBRs and Silencers on the same form and get both approved.
So many reasons you don't want to stop in Maryland, but I believe they are silencer friendly. Triple check before you go. Comply with FOPA which requires uninterrupted passage.
If this is a routine trip, you can get a 5320.20 approved for recurring trips for up to a year.