AR lower receiver question

[stg58fn]

I am new to this forum. Does anyone make a lower receiver with a flat/ flared mag well like the HK416?

[mpardun]

http://www.pof-usa.com/lower_receiver/1fa1f9ad5a9069b1d7076b0c60a89e6d%5B1%5D69.jpg

[markm]

OK w/o odd trigger guard?

I think POF has some non-TardGuard versions...

Check rainierarms.com... I've seen them on their site.