These are some of the finest M4 AR15 I have seen in a long time.
They even include a nice hardcase 
The receiver is LOW CUT ready to accept your RDIAS or convert with 07/02 license, no milling required.


R Guns TRR15 Forged M4 AR15 Rifle - Black | 5.56NATO | 16" Govt. Profile Barrel | A2 Handguard & Grip | A2 Front Sight & Flash Hider
100% USA MADE. LIMITED LIFETIME WARRANTY AGAINST MANUFACTURING DEFECTS THROUGH RGUNS.