User Panel
User Panel
User Panel
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Posted: 1/6/2006 9:45:07 PM EDT
[#1]
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).
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Posted: 1/6/2006 11:20:41 PM EDT
[#2]
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.
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Posted: 1/7/2006 1:45:42 AM EDT
[#3]
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. |
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Posted: 1/7/2006 5:37:03 AM EDT
[#4]
See the data on M14 headspacing in the important data link at the top of these messages.
Don't let some gunsmith tell you your M14 rifle has "excessive" headspace (the implication is that excessive headspace is dangerous, it seldom is) even if it closes on the SAMMI NO-GO gage or "almost closes" on the SAMMI field gage. When I had my M14 parts kit assembled by Smith Enterprise onto a commercial receiver I received a phone call that this was the case and their solution was a bolt exchange. $100 plus my bolt. My rifle, of course, met USGI GO specs as the SAMMI gages are undersized. More detail in the Important Data links above. If the rifle is too long to meet USGI FIELD gage specs then the only real solution is swapping bolts intil you find a "longer" one. TRW bolts are more likely to be long because they were the late production bolts and are less likely to be worn. If you use SAMMI gages note that SAMMI FIELD is shorter than M14 NO-GO. All covered in the links at the top of these messages. -- Chuck |
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Posted: 1/7/2006 8:42:35 AM EDT
[#5]
-- +1. This is a little-known fact. |
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