Can someone tell me if there is any other LPK that will work for the Aero M5?  I have been waiting 10 forevers for Aero to have their parts back in stock with no luck.  I could be mistaken but its my understanding that the takedown and pivot pins are slightly longer making them specific to Aero?  Also, is the M5 compatible with the Phase 5 extended bolt release compatible?  

Thanks!