Complete Stag Lower, Is this a good deal?

[CWeber]

Yes. That is a good deal. Any AR upper will work.

[C-MAC]

Ditto. That's a good deal. Especially with the extras.

Generally the stripped lower with the standard parts kit are about $200-230 (plus shipping) depending on where you get it. I have seen the complete lowers (assembled) from about $225-$260+ depending on which parts kit you get.

[RangerX]

All lowers are NOT created equal when it comes to internal dimensions. Yes they should work interchangeably, however there can be significant differences in the amount of internal machining done.

Google Drop In Auto Sear & Lightning Link and you can start to see some of the reasoning behind the differences. http://www.quarterbore.com" onclick="window.open(this.href);return false; has an assload of info as well.

ar15.com has some great walk throughs, including technical crap like foot pounds of torque, etc. explained in layman's terms.

[RangerX]

I'll clarify my dimension stance: if you are looking at dropping in factory internals, they will fit in all lowers of that same caliber. MOST if not all after-market trigger groups (timney, mccormick, etc.) will also drop in. The manufacturers must do this if they want to sell their products.
Probably a moot point if you bought this deal anyways.

Yeah, OK, I was being nit-picky. I'm just pissed at all the vendors who caved and started to "backfill" the receiver.