The pistol grip is now removable and can be replaced with any AR-style grip that you want; curiously, this was part of the original napkin sketch of the APC9, but didn’t make its way into production until Gen 2. The final large change is that the bolt is modified to allow for trigger groups that can accept Glock and Sig Sauer magazines. The spine of the magazine itself split down the back, something we’ve seen with a lot of clear plastic magazines, and refused to feed due to excessive feed lip spread.