IRT Compatibility: we covered this topic less than a week ago, and some good info came up. Check it out at
http://www.thehighroad.org/showthread.php?t=170364
I'm waiting for delivery on all my little pieces:
$145 Stag Arms compleat lower w/ grip (
www.eaglearms.net)
$505 Bushmaster compleat A1 m4-profile Dissipator upper (custom ordered yesterday)
$9 Three-prong flash-suppressor (DPMS)
$69 Ace Skeleton Entry Stock w/ buffer and spring (the one thing I have thus far)
______
$730
I could have brought it in under $680 if I'd purchased a used A1 or A2 stock w/ buffer/tube/spring. Basically, even using all brand-new parts, I get exactly the variant I want (which nobody makes stock), and it still cost me a fair bit less than a stock M4gery.
Stag Arms makes lowers for CMT and RRA, and also sells under their "house brand." Word on the board seems to indicate that they're a good deal. And at the price that EagleArms sells them for, it's cheaper than buying a stripped+partskit from other folks. It seems to be becoming a trend these days that building from a partskit on a stripped lower isn't as cost effective as it once was.
Good luck on your project, -MV