Keep the gun simple. I've seen some PIMPED M4s, and frankly the M4 is already a pretty amazing gun. If it's for HD use, get a light, don't shoot what you can't identify.
I'm still sort of on the fence about an optic for mine. That said some kimber night sights would be a great investment.
I'm running a titanium extension on mine, no problems whatsoever, and the tube has NEVER loosened up on me.
As for 922r, I've got a US made follower, tube, etc. I even had someone make some operating rods on his CNC lathe for me. That said, I've seen hundreds of professional 3 gunners with M4s, rocking the field stock and mag extension tube. I'm sure if the ATF wanted to they could be a dick about it, but they haven't as far as we're aware.
"There he goes. One of God's own prototypes. Some kind of high powered mutant never even considered for mass production. Too weird to live, and too rare to die."
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