I am finally in preproduction on these kits and will keep you all informed as progress goes forth. It will be a drop-on kit compatible with the lowers from your M4 rifles. The version I will offer is the "standard" style, with the modified M249 front handguards. The entire upper reciever will be machined in the next month, and I will then mold it. The kits will be cast resin, but reinforced with fiberglass and metal plates as appropriate. The "M60-esque" heat shield will be metal.
Pricing per kit is yet to be determined, but will be released once the first prototype is finished. AA members will recieve a discount, and one kit may be offered as a raffle piece for a future AA game.
Just a heads up to let you know what's coming.