Originally Posted by
kymudder08
Can't answer the first part about 80%, but I can the second. Mine was a spikes lower. I put that down as the original mfg with their serial, model, etc. if it says multical, but whatever caliber you intend to build, 5.56, .300, 6.5, 6.8, whichever one. Then there's a spot on the form that says something like "other identifying markings". Bc I'm the one who technically made the actual sbr I put my first name, middle initial, last name and then city,state that I live/made it in. That's the part that's engraved. Most people will advocate that you leave this blank. It's already a requirement to mark the firearm with manufacturer markings (trust name/ city, state) so you don't need to inform the ATF you'll be following the instructions on the form. If you can't see the Caliber on the barrel Bc it's not on it or it's covered up by a rail, you must have that engraved on the receiver as well if it says multi cal. In several years Ive never seen anyone engrave the caliber on the weapon. You stated the caliber on the form. What if I form 1 a pre existing rifle lower marked 5.56 and build a 300 blackout? I wouldn't be require to engrave the new caliber. I'm doing an 11.5" with FSB and 7" rail so the caliber will be readily visible and no need to engrave. I'm not sure how this will work if I buy an additional upper that does have the caliber on the barrel covered up, but from my understanding, it the original upper that matters Bc that's what it's registered with. If I switched to a different 11.5" upper that is covered up and sell the original one that's not then I would likely have to. You can also put any length/cal upper on it you wish as long as it's not permenent and can readily and easily be converted back to original form, IE have the original upper on hand. There is no requirement or statue regarding this. Also, from experience with my dealer, ATF isn't too concerned about the caliber marking and the chances of it being an issue are slim, but it's recommended you have it. It's only an issue with stripped lowers.
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