? for M14 guru's

Simon

Simon

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So I got this SA bolt the other day and fitted it in my M14 as per skullboy
instruction in the FAQs. Bolt close on go gauge and no go ( 1.634 ) but do not
close on the field gauge. Bolt is fitting very tight, there is no play when try to
move it with a finger.

So I decide to try it at the range, problem is that the brass come out damaged
(see pics below) and I have clue on what is going on. Gun is cycling well as far
as I can tell with no feeding issue. I did not have this problem with the chinese
bolt.

What the hell ? :bangHead:
DSC00522.jpg

DSC00523-1.jpg
 
Apparenty, a Chinese bolt will not fit in U.S. models so I would guess vice versa is also true, I haven't checked the mods you have done to get S.A. to work in your rifle but something tells me the damage is done when rounds are being chambered, how is its accuracy.
 
Brass looks normal. You can tweek the ejector and extractor springs a little to reduce brass damage, but there isn't much point.

Did your nork bolt close on the field gauge?
 
Simon said:
I did not even test the norc bolt with the gauges, I just swapped it without checking. Too afraid my #### would fall off without a gi bolt.:redface:
Click to expand...

generally the swap to a USGI bolt is to reduce headspace to get better case life when loading, but if it closes on a no-go I wonder if you are any farther ahead...?
 
scout800 said:
Mines like that too, I belive its from the bolt hitting the casing during ejection, I have reloaded round like this with no pproblem... RELAX!
Click to expand...

Ok, I did no know brass damage was nothing to worry about.

Good to know thanks.
 
Hitzy said:
generally the swap to a USGI bolt is to reduce headspace to get better case life when loading, but if it closes on a no-go I wonder if you are any farther ahead...?
Click to expand...

I will have the headspace checked before I shoot it again.

If I have the barrel indexed , could it reduce the headspace ?
 
It's a military gun, it's job is to remove fire shells with 100% reliability, not pamper them in the process. Mine dings the brass also, not a problem.
 
Fitting an M-14 bolt involves a tad bit more "gunsmiting" ...

Did you lap both the bolt lugs to the receiver for maximum bearing surface?

Do both the left and right lug show good bearing?

If the bolt is bearing evenlly on both sides , then you can assume the bolt is straight in the receiver.... which means you can assume that with a commercial gauge inserted in the chamber, headspace can be guestimated accurately, by running a feeler gauge between the right lug of a STRIPPED bolt, and the receiver.

If you had one of the rare military 7.62 NATO gauges that are relieved for the ejector, you don't need to strip the bolt.

Otherwise, the very strong ejector spring will force the unrelieved commercial headspace gauge forward, giving a totally false reading.

PS: Of dozens of GI bolt/Chinese receiver fits I've done up, the problem is almost always too tight, not too loose.

And,
reindexing the barrel will not affect headspace much ... 1/4" draw would be roughly .001"

LAZ 1
 
Thanks for the precision Laz, gauge were inserted with the bolt unstripped.

Will take another trip to the smith to have it checked again.
 
Last edited:
actually I think the damage is caused when its stripped from the mag to be chambered. I noticed it when I went hunting and removed them from the chamber.
 
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