a3 front sight post

[browningautorifle]

"Water World"

Was one of my favorite movies back then.

Information

Warning: This is a relatively older thread This discussion is older than 360 days. Some information contained in it may no longer be current.

[ArtPahl]

I am wondering what is going to happen to the headspace when you twist that barrel. Your OP said the sight was at 11:00. That's 1/12th of a turn (30 degrees). At 10 t.p.i., that's backing off .0083 and, of course, headspace tolerance is .006. The out-of-plum condition is probably not that bad but even at only 10 degrees (which would be hard to notice), that's adding .0027 to the headspace, which is a pretty good chunk of the .006 tolerance.

Is the barrel going to be loose? Will the torque from firing in the RH twist tighten it up again?

I still say move the sight and leave the barrel alone to avoid more problems.

BTW: What about the rear sight? Is that centered with the front sight cock-a-skewed? Are you going to have to relocate that, too?














































btw;

[ssgross]

Your OP said the sight was at 11:00

That was rough estimate. The point was to stress that it is obviously off. After looking at the extractor groove, I don't think it is nearly that far off. It looks better or worse depending on what angle you look at it or take the picture from.

that's adding .0027 to the headspace

Thanks for the specs.

What about the rear sight? Is that centered with the front sight cock-a-skewed? Are you going to have to relocate that, too?

At zero with the skewed front sight, you can see the rear sight location skewed left of center to compensate. Rear sight is easy to adjust/drift on this rifle and I'm not worried about it.
Actually, with some simple trig we can figure out the exact degree of rotation required, using the rear sight offset (easy to measure) and the height of the "A" blade above the bore. Let me measure. That will at least give better than an eyeball ballpark.
Angle = arcsin(D/H), where D is the distance the rear sight is drifted to zero, and H is the sight height.

[browningautorifle]

the rear sight location skewed left of center

I'm looking at the rear sight in this pic and see a stake mark/zeroing line on the right side. That must be for alignment of the rear sight at assembly so it doesn't end up too far left? Unless you cranked it over for the pic, it's at zero.