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Posted: 3/18/2001 12:56:01 PM EDT
I got this Colt AR  labled  Sporter Match HBAR.  Serial# 063xxx.  Has a bayo lug and FH.  How can I tell if this is a "Green Label" gun or not?  I'm new to these rifles and not to familiar with the specifics.  Also the barrel stampings read as follows:

C  MP 5.56 NATO 1/7

I know C = Colt and 5.56 is caliiber and 1/7 is rifling twist.  Whats MP and does this barrel have a chrome lined bore?

TIA
Link Posted: 3/18/2001 3:03:35 PM EDT
Yes, the barrel is chrome lined.  
Link Posted: 3/18/2001 4:18:43 PM EDT
Does your SN begin with MH? If so you have a "blue label" model R6601. Unusual for it to have a bayo lug from the factory but possible.
Link Posted: 3/18/2001 4:29:22 PM EDT
I have a some 6601s in the MH053xxx and MH047xxx range. They are both "blue label" Sporter Match HBARs with sear blocks, large H/T pins, small front pivot w/ drilled fence, and none came with bayo lugs. Your barrel may have been changed or the upper swapped out. You can call Colt w/serial number to verify your preban status.
Link Posted: 3/18/2001 4:41:59 PM EDT
Colt 800-962-COLT
CC001616 and Below - Pre-Ban
CH019500 and Below - Pre-Ban
GC018500 and Below - Pre-Ban
LH011326 and Below - Pre-Ban
MH086020 and Below - Pre-Ban
NL004800 and Below - Pre-Ban
SL027246 and Below - Pre-Ban
SP360200 and Below - Pre-Ban
1963 SP00001-SP00023**
1964 SP00101
1965 SP02501
1966 SP05600
1967 SP08250
1968 SP10750
1969 SP14000-SP14653
1970 SP15001-SP15473
1971 SP16001
1972 SP19401
1973 SP24201
1974 SP32601
1975 SP43801
1976 SP55301
1977 SP67651
1978 SP83400
ST038100 and Below - Pre-Ban
TA10100 and Below - Pre-Ban
BD000134 and Below - Pre-Ban (AR-15A3 Tactical Carbine - very rare model)
MT00001 and Above - Post-Ban
BK000001and Above - Post Ban (CAR-A3)
CST000001 and Above - Post-Ban (Began Late 1997 Production)
CMH000001 and Above - Post Ban
CCH010000 and Above - Post Ban MT6700, MT6700C and MT6700CH series, 1998 produ
Link Posted: 3/18/2001 4:55:38 PM EDT
The serial# does begin with MH.  According to the serial # list on the old site this is a preban rifle.  Doing some research I have found that Colt didn't ship this rifle with both the lug and FH.  They shiped with the FH only from what I can see.  Anyway I like the rifle very much!  I guess the barrel was changed or the whole upper was changed.  Is this a bad thing?  I hope not!  Also this thing about pins and what not.  The reciever has 1 pin just above the grip and another right above and in front of the mag well, both the same diameter except the one near the mag well has a "head" on the right side with a flatened portion that rests against a raised fence around the mag well.  Also this pin has small holes in the ends that would seem to be for a pin punch or something.  On some Colts I have seen a screw in this position.  Whats the difference, which is more desirable?  I got this rifle on a whim, the deal just fell together, did I get a good rifle?  I have a Bushmaster on order that will be here this week that would have been my first AR but like I said I just came across this so I'm naive about alot of the details.

Thanx for all the info keep it coming!  This site is great!
Link Posted: 3/18/2001 5:19:25 PM EDT

Correct me if I'm wrong, but doesn't "MP" refer to "magnetic particle"?  As in:  "Magnetic Partical Testing"?  Magnetic Particle Testing is a method of testing metal objests for small cracks.
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