Hello all, I have a question regarding Colt post-ban lower receivers.  Do post-ban (recent manufacture) Colt lowers have standard-sized fire control parts or are they like my Blue Label Sporter pre-ban lower and have larger part sizes?  Also, do the post-ban lowers have a sear block like my pre-ban?

I'm going to build myself a nice post-ban rifle and I can't decide whether I should use a post-ban Colt lower or a post-ban Bushmaster lower.  For this rifle I would rather have a more "mil-spec" lower receiver.  

I don't want to start any Colt vs. Bushmaster fights, but aside from the cost differences, how do recent Colt lowers compare to recent Bushmaster lowers?  I'm looking for factual specs here, not fit/finish opinions.

Thanks in advance for any assistance.

Thanks Troy, you da man!