I built an SBR with a 516 G2 Patrol 10.5” upper and M400 lower. I put “M400” as the model, since that’s what the paperwork said and if they track the serial number back Sig would show it as an M400. No issues with the Form 1.
![Trigger Air gun Gun barrel Machine gun Gun accessory]()
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M400 Form 1 - what are people using successfully for a model?
I picked up a new PM400 11.5” 5.56 pistol with the intent of SBRing it. However, it doesn’t have a model name, number or caliber on the lower - “SIGM400” only appears on the upper.
Those of you that have sucessfully SBRed their M400 on an E-form 1 - what did you put for a model number? I’m thinking of submitting a photo that shows both the lower and upper engraving and calling it a “SIGM400.”
Photo from the web:
![White Air gun Black Trigger Line]()
Those of you that have sucessfully SBRed their M400 on an E-form 1 - what did you put for a model number? I’m thinking of submitting a photo that shows both the lower and upper engraving and calling it a “SIGM400.”
Photo from the web:
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