My A2 is done.
I can finally join the party.
Kinda liking the weight of this HBar, the balance isn't bad either.
Colt

MT6601

1:9 Chrome-lined
Spikes Tactical Nickel Boron Bolt Carrier Group
LRB Lower
Spikes Tactical Lower Parts Kit
Cavalry Manufacturing C1 Butt-stock and Buffer Assembly
OTIS Butt-stock Cleaning Kit
U.S.G.I. Silent Sling
= $877.62 counting all fees and S&H
Later additions: Spikes Battle Trigger

Very nice. I'm curious about the 1/9 twist in the 6601. I bought a 6601 a couple of months ago and installed a Colt A2 government profile barrel assembly. The HBAR barrel that was original to the gun had a 1/7 twist.
Very nice, how do you like that NiB BCG?
I'm building an A4 right now minus the railed forearm.
Very nice looking A2, of course it looks just like mine.

Nice looking A2, how does it shoot?
Very cool rifle, I have a lower coming soon, may have to build one of these babies.
Nice gun! I can't wait till mine is done!
Mine should be original to it, marked: C MP 5.56 NATO 1/9 HBAR
After reading this thread, now I don't know if it's a 6601, but then again, it might be. Every time I've seen a 6601, it was a 1/9 (granted, I have a
very poor memory.

)
http://www.ar15.com/forums/t_3_118/310680_Does_my_Colt_have_a_chrome_lined_barrel_.html.
It's going to be a while before I can shoot it, so forgive me if I can't really answer anybodies questions that aren't possible until then.
How do you like the Cav buttstock? I thought they were A1 length?
Originally Posted By SIPCAT-C:
How do you like the Cav buttstock? I thought they were A1 length?
It is A1 length and a good fit for me. (5'8")
It's lighter than an A2, so if you have concerns over having your rifle front heavy, it might not be a good match.
The interior is larger without the foam filling, it appears it will take two OTIS butt-stock kits compared to an A2.
Overall, it's nice and I'll be getting more in the future.
ETA: I ordered the Cavalry butt-plate at the same time and it's made of the same material and is easier to open than my old A2.
The sling swivel swings freely.