Guys I am filling out a form 1 for a SBR. However I have a questions regarding Original Manufacturer and Caliber. The original manufacturer is a Bushmaster Lower 5.56 but I will be making a .300 AAC. Do I put under the
"4c Caliber" 5.56 or .300ACC? Also, the overall length is with the stock fully extended correct? Thanks
Alpha, watch several of them and none talk specifically on this item. Plus there is too many discrepancies in most of the video's I've watched. I'm probably just going to call the local ATF and be done with it.