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What barrel did you go for?
I originally got a Mega Arms SS barrel, but replaced it due to a very tight chamber with the AP one... I'm happy very happy with the AP one.
A mate ANTMAN has the Mega...

https://en.wikipedia.org/wiki/Mk_12_Special_Purpose_Rifle

Nice! looks the part! I think I will put my spare KAS covers on mine...

Here is the Mk12 build for the American Sniper movie...
61356

Make: Colt
Model: M16A2
Caliber: 5.56mm
Barrel...

The US used the Mk262 ammo in their Mk12 Mod 0 and 1's...

Cartridge, Caliber 5.56 mm, Special Ball, Long Range, Mk 262 Mod 0/1: 5.56×45mm 77-grain Open-Tipped Match/Hollow-Point Boat-Tail...

Yip...
Bit of a bitser...
Spikes upper, Spikes 12" BAR rail, Spikes gas tube, AP 18" SPR 4150 barrel, JP adjustable gas block, Mega billet lower, Geissele G2S trigger, AP NB BCG, Lantac muzzle...