I searched and did not see any discussion on this, but my firearm (CA optics ready) came with a threaded barrel and cap. Interesting enough I did not see this cap on other versions of this firearm(they either had non-threaded barrel or a some type of flash hider pre-installed). So my question is what have you guys added to it and if so what are your recommendations? I don't think it needs a muzzle brake to be honest so probably a flash hider of some sort (this is more an aesthetic issue for me versus function).