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Originally Posted by too_many_hobbies
What reduced length is recommended (10.5", etc.)? Any disadvantages to a shorter barrel? Will the gas port have to be relocated after the barrel is cut off? I am familiar with applying for a tax stamp for a sound suppressor. Any details to applying for a short barrel rifle? Can I go ahead and apply now so I will have the permit by the time I get the barrel back from the gunsmith?
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According to the ATF, you MUST submit and receive back your Form 1 to Make a Short Barreled Rifle before you possess the parts to make a short barreled rifle. So if you are gonna do an SBR, start that first so that can go through the ATF pipe while figure out what length you want a get the smith to work on your barrel. You will also need to get your lower engraved as part of the SBR process, and that takes time too to send off and stuff.
How long is up to you, you can get up to max subsonic in a pretty short distance. 10" is a good number, you could go a little shorter or a little longer. I think around 7" is the shortest you can go and still get the gas system to function.
I have a 9.5" 300 whisper barrel on order, it should be on a lathe about now. I already have a registered SBR with a 10.5" 5.56 barrel. The 5.56 runs great. I can't say the 300 mine runs yet, but I'll post when I get it put together. I went with a .100 gas port and adjustable block.
You will probably want a pistol position gas port-- if you dont already have one.