We, at APH Tactical in Lawton, would love to build you a custom 300 upper, which of course would enable you to use any handgaurd and muzzle device you like. We also offer cerakote services, so if you wanted, we could match all of your uppers to your lower reciever. Also, we are a Class 2 Manufacturer, so if you wanted to wait for the tax stamp, we could build you a tuned, dedicated-suppressed 300BLK upper with an overall "barrel" length of 16" so you don't have to SBR your lower. Please feel free to PM us anytime.
Take Care,
Mike
Mike, you have my attention! I'll send you my cell # over private message.