Bennett, yes, the Gen 1 and Gen 2 Magazines are cross compatible. Diamondback has not upgraded the status to being +P Rated probably for both safety and warranty reasons. In fact the same verbiage is in the G2's Owners Manual [Do not use ammunition designed for “short barreled” pistols. Do not use ammunition over 124 grains.
Low power ammunition and/or light-weight bullets may cause failure to feed problems due to the lack
of energy needed to cycle the slide. These ammunitions are more likely to cause problems if the grip
is not held firmly. Do not use steel cased ammunition due to possible premature wear on the extractor.
This will void the warranty.].

These magazines are the same in both gen 1 and gen 2 guns Diamondback does not mention the use of +p ammo in the owners manual so I suggest calling Diamondback to be 100% sure Customer Care Call Center Toll Free: 1 (877) 997-6774

the magazines are the same in both gen 1 and gen 2 guns Diamondback does not mention the use of +p ammo in the owners manual so I suggest calling Diamondback to be 100% sure Customer Care Call Center
Toll Free: 1 (877) 997-6774