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EMDII
March 21, 2003, 09:00
USGI MilSpec chambers:

HS dims for mil guns:
M240-
- G 1.62531"-.0002"
- NG 1.63988"-.0002"
- F 1.64185"-.0002"

M14-
- G 1.6355"+.0002"
- NG 1.6415"+.0002"
- F 1.6455"+.0002"

M60-
- G 1.6380"+.0002"
- Looked for NG dim with no joy.
- F 1.6455"+.0002"

Commercial:
compared to civ gages (Forster)
G 1.630"
NG 1.634"
F 1.638"

Source:
Walt Kuleck, Dr., well-known M1 and M14 builder
:wink:

Scott Jimenez
March 21, 2003, 14:41
Walt is not the source for those dims.

Tweak posted those on AR15-L in response to Walt's post.

reference:
http://groups.yahoo.com/group/AR15-L/message/26991

Right Side Up @ 1000 MPH
March 22, 2003, 00:30
Originally posted by EMDII
USGI MilSpec chambers:

HS dims for mil guns:
M240-
- G 1.62531"-.0002"



Is that right? 1.62531"?

It just seems kind of short. Maybe a typo?

EMDII
March 22, 2003, 00:49
You are correct, twas the Tweak!

Thanks!

rwwje
March 22, 2003, 06:01
M240 headspace dimensions listed to 1/100,000 of an inch is ridiculous (and way short on the go gauge side like Right Side Up @ 100 mph notes).