Quick question for you guys. I currently have an 11.5" AR in 5.56. It was built by me on an individual form one. I am interested in building a second SBR (this one on a trust) and I am leaning towards the 300 AAC BLACKOUT, not 100% sure though. When I fill out my form one this time, should I just fill in 300 BLK for the caliber or should I go with a caliber that I know will be around for a while like 5.56. I am aware of the fact that I can have multiple uppers for one lower, but I figure why not set up another?
My concern is we never know what the future holds. I do not want to have a receiver registered as a 300 BLK and find out the cartridge disappears in 5 yrs. If I register two lower receivers in 5.56 with one upper that I will always keep, I will always retain the ability to put them back in the configuration it was registered in. On the other hand, If I register one in 300 BLK and it disappears in a few years, Then I won't be able to sell the upper or reconfigure and get something else because I will no longer be able to put it in the config it was initially built in and if I wanted to change calibers it would require additional paperwork. This is mainly a result of ATF no longer accepting MULTI for caliber and barrel length.
This is a paperwork/legality question, not a this caliber vs. that.
Thanks
ChrisM
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