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2/27/2003 4:12:09 PM EDT
I am wondering if the barrel on my Colt Lightweight Sporter, Model R6530, is chromed.  It doesn't look like it, but I'm not completly sure.  S/N:  SL0271XX.
Stamped on barrel:  C MP 5.56 NATO 1/7.
Has flash hider, no lug.
Also;
.223 is stamped on side of receiver.  Does this weapon have the 5.56 chamber (note barrel stamps), or the .223 as stated on receiver??
Thanks!
Jim
2/27/2003 4:42:39 PM EDT
[#1]
IIRC (the lettering, I'm SURE of the rest), the "C" means it has a chrome-lined bore, the "MP" means the barrel has been magnetic particle inspected, it IS chambered for 5.56x45mm NATO ammo with a rifling twist of 1-in-7 inches.
2/27/2003 4:47:32 PM EDT
[#2]
Don't know about current models, but ALL the older Colts are marked .223 on the reciever, and 5.56 on the barrel.  The .223 marking means nothing, It's chambered w/the same 5.56 reamers they used on the M16s[:D]

The "C" is supposed to stand for a chromed chamber, according to "Bigger Hammer".  A fully chromed bore would be stamped "CB".
2/27/2003 5:54:08 PM EDT
[#3]
Thanks for the responces.  I think shamayim is probably correct.  The chamber is chromed, the bore isn't.  While I think a chromed bore is preferable, the chromed chamber is probably more important.  At any rate, this is a very sweet looking rifle.  It has the fixed stock which I prefer, and I'm looking forward to shooting it.  It is currently unfired, but I have plans to fix that soon.  Just purchased 1K rounds of LC XM193...!
Jim
2/27/2003 5:55:23 PM EDT
[#4]
C hasn't meant chromed chamber in decades, you wont find CB (chamber & bore) anymore either.

C = Colt  (B = Bushmaster, I don't recall FN's stamping)

The rest is correct.

Your chamber in any event is the M16 type and its chrome lined (all Colts at a minium have the chrome lined chamber for reliability).  Talk with the guys in the Colt section of the Industry forum they could tell you if your particular model had a lined bore or not.

2/28/2003 4:48:35 AM EDT
[#5]
Quoted:
C hasn't meant chromed chamber in decades, you wont find CB (chamber & bore) anymore either.

C = Colt  

View Quote

Well, yes, but when they changed over to "C" meaning Colt, they also started stamping "chrome bore" on the barrel so I guess if it doesn't say that, it ain't chromed???
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