[ARCHIVED THREAD] - Older upper question

Posted: 2/15/2007 9:03:46 AM EDT

From the retro thread.
By 1969 and before serial number 1,750,XXX Colt's chrome chamber barrels were marked C MP C, and the proof markings and C were moved to the same spot. This marking was used as late as 1970 or 1971 and serial number 4,552,XXX. The C means Colt’s, the M means Magnetic particle inspected, the P for Proof fired, and the C near the muzzle for Chrome chamber. (late C MP C pic provided by yfs200):

Some 1969 CMPC barrels had chrome all the way out onto the locking lugs and part of the feed ramps. 1969 CMPC barrel on right, chrome chamber and bore barrel on left:

The upper I just got is a slab side receiver and the barrel is marked C MP C, is just the chamber chromed or is the whole bore. It looks shiny and I can see the chrome in the extension.

I can take pics if necessary.

Posted: 2/15/2007 9:38:46 AM EDT

[#1]

It has a chrome chamber only.

Posted: 2/15/2007 11:33:19 AM EDT

[#2]

Thanks, I bought the upper for a 22LR kit so that should be just fine.

[ARCHIVED THREAD] - Older upper question

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[ARCHIVED THREAD] - Older upper question

[ARCHIVED THREAD] - Older upper question