Recent development, the MAG-AD9 system is not compatible with New Frontier, PSA Hybrid or Foxtrot Mike bolts. This is due to the lug which strips a round off of the magazine being further from center-line as compared to Colt bolt systems. If you are looking to use these bolts with with our system we will provide bolt modification services with the purchase of a mag-ad9. The bolt must be Colt style other than the stripper lug length as indicated below.