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Brayden, yes Sir. The FX-9 was designed to be completely modular. Outfit it with any Freedom Ordnance barrel length and customize it with a nearly endless amount of AR-15 accessories. We do not recommend using aftermarket lighter weight triggers, if you wish to try an aftermarket trigger group we recommend keeping your factory supplied trigger group nearby for re-installation as it has more disconnector engagement built into it than a normal mil spec trigger group or after market trigger group.

With the AR 9 platform, you may not want to use your buffers from your 5.56/.223 rifles, as the bolts in the AR 9 platform have weights in them making them heavier, as they are "blow back" systems, sending more force back against the buffer and towards the user. Due to this, is is suggested to use heavier buffer springs and weights, so that the recoil is more manageable and less stress is placed on the bolt, buffer and receiver. Typically, the trigger group can, in the event that the 9mm BCG allows for it, to be reused. The charging handle will be fine, however, many charging handles used in the AR 9 platform do not have the hole for the gas key, as, again, they are blow back, not Direct Impingement. This should not cause any issues with properly charging and manipulating the BCG. Hope this helps.