The MAG Tactical Systems MG-G4 AR-15 Lower Receivers manage to be more than 3 ounces lighter than a standard lower receiver while still boasting all alloy construction.
These receivers utilize a different metal alloy than a typical lower receiver (MAG Tactical Systems calls it MAG Alloy) and some smart machining to reduce the overall weight of the receiver by 35%. The MG-G4 lower is mostly similar in dimension to a standard lower but the hammer and trigger pin holes are reinforced requiring longer pins which are provided. The longer trigger and hammer pins are the only non-standard parts that are required. The MG-G4 also features an over-sized integral trigger guard.
Many people, myself included, will be skeptical about a lower receiver that is manufactured from a new alloy but I am always glad to see manufacturers trying something new to advance the state of the art. Only time and round count can truly tell how these lowers will hold up.
They are available in black and FDE and, believe it or not, the MAG Tactical Systems MG-G4 lowers are in stock now at Brownells.com!