I believe the Aero M4E1 is a forged lower with billet aesthetics. I have three builds using them with no issues so far.
Seekins has forged receivers also. I have one of those also but has a 9 inch aac upper on it
Every complete AR15 rifle on the Seekins Precision website is assembled with their billet receivers. Even their lowest cost AR15 has a billet lower. And all they offer in their parts selections are their billet upper and lower receivers.
https://seekinsprecision.com/rifles-new/modern-sporting-rifles.html
Keep this in mind. I purchased two sets of billet upper and lower receivers in the past, to try out. Doing on line research, forged receivers are stronger than billet receivers. That means Aero or Anderson forged receivers are stronger than billet AL receivers, period. A $49 Anderson AR15 lower receiver is better than somebody's CNC billet AL receiver in terms of strength. A CNC billet receiver allows for aesthetic design, visual uniqueness vs a forged mass produced item.
I have purchased prob 15-20 new Anderson lowers over the years and never had a problem one. I did have to return and exchange a billet upper receiver with the manufacturer due to defective threading. Aero Precision is known for impeccable products, a step above Anderson.
Quote from article linked below: "Metallurgists agree that a forged piece of aluminum is stronger than cast or billet. The reason being, when the material is shaped under pressure, its ‘grain’ follows the same shape as the part."
https://www.ammoland.com/2014/08/ar...t-vs-billet-vs-forged-aluminum/#axzz6d7lt62Az
Detailed explanation of cast, forged, or billet receivers: https://www.80-lower.com/80-lower-b... that a forged,allowed by the forging process.
But the question I guess is though structurally forged maybe stronger. Why the increased need for strength?
Because it's cheaper.
Or because some people want to torture test their rifle by driving over it?!
Is a forged receiver stronger than a block of billet? Yes.
Does that matter? Probably not.
Arguing that forged is stronger to justify purchasing cheap receivers is a bit silly.
It's not an argument, it's a discussion. I'm laying out the facts for the OP, so he can make an educated decision concerning his purchase. You don't like the facts so you call it silly and an argument. You always want to appear as "the expert" here and the last word concerning the AR15 and have a very hard time admitting when you are wrong. This isn't the first time this has happened.
A forged lower receiver is stronger than a billet receiver. Documented in numerous detailed articles on line by real experts. Why spend more for an inferior product? Because it looks pretty? Because Dave_M says so?
Maybe for the uninformed.
Is a forged receiver stronger than a block of billet? Yes.