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Nothing except the P4 model features a Nano Composite Parts Kit. This kit includes the hammer, trigger, disconnector, takedown pins, safety selector, magazine release and detents all made form nano composite material. The difference in cost is more a factor of number of each in stock than anything else.

the P4 model features a Nano Composite Parts Kit. This kit includes the hammer, trigger, disconnector, takedown pins, safety selector, magazine release and detents all made form nano composite material. The difference in cost is more a factor of number of each in stock than anything else.