Not as good. major flaws in the design/ sucks & major headaches - American Built Arms Company Remington MOD*X GEN III Modular Rifle System

The Design is Semi decent.
Watch the many views on YouTube.

Comes with Military Spec Buffer Tube.
The Buttstock that comes with it cheap and flimsy. Never stable.

Got a Luth AR stuck, so I can go a full inch in height for the cheek weld, needed an A2 Tube. Which understandable. Got the A2 tube and put Luth AR stock on it. There is nothing to lock the Stock on the receiver... no End Plate detent or anything to allow the front end of the stock lock in place.
The only thing to hold the buttstock to the tube is the rear screw .. and it keeps spinning.. for sniping thats a bad day every day..

Called AB Arms, no response.

Some says there is an adapter that will install at the end of the lower receiver at the buffer tube to lock the front end of the buttstock, AB arms has nothing on their website.

Back to Mil Spec buffer tube and selling this hunk garbage metal ... Go Cadex or MDT or Accuracy International. Heck, get Magpull is better than this garbage...

AB Arms, here is an advice,
Wanna copy Mil spec, design it properly as a copy and don't leave major design pieces out of it so you can create an adapter and sell it later on to make money...

Stay away from this Junk.