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Posted: 1/6/2006 2:23:07 PM EDT
If I buy a new or used chrome lined bbl. for my gunsmith to change out on my M1A, how can he headpace it w/o a bucket of bolts to try out since you can't ream the chrome chamber???
Link Posted: 1/6/2006 9:45:07 PM EDT
No, Chromed lined barrels/chambers can not be re-reamed since this will cut/flake the plating and you will have a mess on your hands (more flaking when shot).
Link Posted: 1/6/2006 11:20:41 PM EDT
Normally, you find a bolt that is the best fit then lap, lap, lap. Excluding that, you modify your bolt/receiver and lap, lap, lap.
Link Posted: 1/7/2006 1:45:42 AM EDT
Chamber machining of chromium plated M14 barrels is allowed to obtain satisfactory headspace. I'm not saying this is the first choice to get the proper headspace but it is permissible by M14 Military Specification.

Per Military Specification MIL-R-45012E Rifle, 7.62MM: M14

3.3.1.1 Barrel. The barrel shall be free of cracks and seams.
The chromium plating shall be free of nodules, flaking, pits, stripping,
anode burns and evidence of etched base steel, There shall be no
machining, such as honing or grinding, after application of the chromium
plating except as maybe required for obtaining the specified headspace
and dimensional requirements at the muzzle. Burrs and sharp edges shall
be removed from chamber edges. Scratches or marks, occurring in a
chamber which otherwise meets the surface roughness requirements, shall
be permitted provided they do not cause marks on the case of a high-
pressure test cartridge fired in the chamber.
Link Posted: 1/7/2006 5:37:03 AM EDT
Link Posted: 1/7/2006 8:42:35 AM EDT

Originally Posted By Different:
Chamber machining of chromium plated M14 barrels is allowed to obtain satisfactory headspace. I'm not saying this is the first choice to get the proper headspace but it is permissible by M14 Military Specification.

Per Military Specification MIL-R-45012E Rifle, 7.62MM: M14

3.3.1.1 Barrel. The barrel shall be free of cracks and seams.
The chromium plating shall be free of nodules, flaking, pits, stripping,
anode burns and evidence of etched base steel, There shall be no
machining, such as honing or grinding, after application of the chromium
plating except as maybe required for obtaining the specified headspace
and dimensional requirements at the muzzle. Burrs and sharp edges shall
be removed from chamber edges. Scratches or marks, occurring in a
chamber which otherwise meets the surface roughness requirements, shall
be permitted provided they do not cause marks on the case of a high-
pressure test cartridge fired in the chamber.


--
+1. This is a little-known fact.
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