PSA mentions that its marked "Cal Multi" for accommodating most builds. Is this just an advertising strategy or do most of the listed lowers in this thread have this feature?
I've noticed also that some of the trigger's call out for specific pin sizes but I don't see the sizes listed on the stripped lowers. I'm guessing I would have to call for that info on some of them.
I'm sure this is a dumb question, but what is an FFL. I've never ordered a firearm online. I do know that you have to have it shipped to a local licensed gun dealer. And is it correct that the only part of an AR that needs to be registered is the stripped lower?
Thanks for all the recommendations.