pboneal Posted August 23, 2013 Share Posted August 23, 2013 What if anything would you need to do to legally use an 18" barrel and 2 round tube on a Factory SBS with C stock? Sometimes it might be fun to use it as a full size. Quote Link to comment Share on other sites More sharing options...
BLACK Posted August 23, 2013 Share Posted August 23, 2013 I am by no means an attorney. I think that once you put a full size barrel on the gun it is no longer a SBS. In regards to 922® on a full size gun: since you're running a Collapsible Stock you will need four (4) US parts and your 2 round extension does not count. So you could do mag follower, handguards, hammer and sear. Quote Link to comment Share on other sites More sharing options...
KB Fab Posted August 23, 2013 Share Posted August 23, 2013 (edited) If the M4 is registered as an SBS, then it's an SBS regardless of whether you put an 18" barrel on it. I checked this out with my class III dealer when I bought mine. I already had an full size version but was just curious. Actually, you can take it off the registry but then you would be hosed if you wanted to put the 14" barrel back on there. You're fine if you want to swap barrels like that. Edited August 23, 2013 by KB Fab Quote Link to comment Share on other sites More sharing options...
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