I want a midlength Gordy-ish upper

[higginsworksforme]

I have a Faxon 14.5" Gunner profile barrel. What do I need to know about the Allen Engineering or possibly Otter Creek silencer fitment? OCL makes a couple mounts that thread onto 1/2x28 that emulate the collar and AE makes this model they say needs less room: AEM-4

 

[unclemoak]

I’m not sure hanging a 20+ oz can on a pencil barrel would be a good idea, that aside, what do you want to know?