The AREX Delta is a true double action striker-fired pistol. The Deltas striker spring is only partially compressed as a cartridge is chambered. Modular design enables you to customize the firearm to your needs and preferences. Removable front and rear frame inserts incorporate slide guides and hold the complete fire control mechanism yet only the front insert is a serialized part that must remain with the firearm while everything else may be customized or exchanged if necessary or desired.