lower receiver confusion

[mutt]

All in spec forged lowers are the same, period. The key being "in spec". If a lower is made to the proper specs then it is good to go. Seeing you'll have this lower for the rest of your life after you add it to the NFA registry, pick a good quality one with the roll mark you like. Or, if you have a factory rifle you already like and trust, just register that lower and swap uppers as the mood suits you. While I prefer Colt and BCM lowers, there's nothing wrong with the many PSA lowers I've used. I've found boutique lowers, like a $300 Noveske, don't really seem any better than a $50 PSA other than subjective "fit and finish" (and yes I have a Noveske lower). Just make sure you get a dimensionally correct lower and verify its function BEFORE you go and form 1 it.

And as others have said - get your form 1 in before 41p gets implemented.