was going to ask in pm, but then

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lurker
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Re: was going to ask in pm, but then

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shinzen wrote:
Fri Oct 11, 2019 9:35 pm
May also want to shoot it without the faux hider to see if it changes anything.
i was going to try that before i noticed that the front sight is part of the hider :oops2: someone makes a sight that attaches to the gas cylinder but i don't have one.
Here's a vid on the crowning. It's super easy. Jump to 1:26 to see the how.
"super easy". i like the sound of that, will watch it in a bit, thanks.

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Re: was going to ask in pm, but then

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It helped my old sks. I think the new owner is happy with it.

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Re: was going to ask in pm, but then

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the bore(centered, more or less), the bore(pretty much down one side), and the (recessed) crown. no, not intended as social commentary. that's the firing pin down there at the end, on the bolt face. not seeing any coppery scuffing in the flash hider, or gouges in the carbon deposits.
looks ok to my unskilled eye. opinions?
LUGO1670.JPG
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Re: was going to ask in pm, but then

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I zoomed in on the bottom picture, but can't quite tell- does it have a ding at about 8 o'clock and another at 6 o'clock? Or is that just the photo?
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Re: was going to ask in pm, but then

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shinzen wrote:
Sat Oct 12, 2019 8:14 pm
I zoomed in on the bottom picture, but can't quite tell- does it have a ding at about 8 o'clock and another at 6 o'clock? Or is that just the photo?
thanks for the reply. i know it's a bit ambitious to ask for opinions based on a single photo.
i think that's the land of the rifling making it thicker. i'll try to get a better pic tomorrow when it's light. might not be right away, there's a gun show in town i want to see tomorrow.

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Re: was going to ask in pm, but then

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being pig-headed, i've been watching videos and mulling this over for 3 weeks, and my conclusion is that maybe there ARE dings on the muzzle*, and that lapping may be the solution**, or at least it's cheap enough to try without a big outlay of cash. so today i got some brass screws and valve lapping compound and ordered up a 45 degree brass crown lapping tool from brownells https://www.brownells.com/aspx/search/p ... 53&pid=679, which is expected to arrive by monday. so the question in my mind is, try the screw head first, or wait for the tool to arrive and start with that?
* how they got there inside that flash hider eludes me
** i have "reasons" to believe this, or maybe i'm just rationalizing. A: the sight adjustments i've done are opposite what i think i'd need to correct an out-of-index barrel, and, B: i tapped a .308 bullet into the muzzle just enough to engage the rifling, and the marks it made are noticeably bigger on one side than the other.

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Re: was going to ask in pm, but then

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If you ordered the tool to do it, may as well wait
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Re: was going to ask in pm, but then

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I second that.
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Re: was going to ask in pm, but then

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thank you both very much.

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Re: was going to ask in pm, but then

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tool arrived saturday, gave it and the #10-24 brass screw a try today, looks and feels much nicer, no snags or rough spots. now just have to get it out to the range.
cleaned the grit out with water, followed by a boresnake.
caught myself wondering if a flat base .308 bullet chucked up in the drill would work for this? i have a coffee can of them for reloading...

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Re: was going to ask in pm, but then

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finally made it to the range. makes a nice tight little group now at 25 yds (maybe because i was shooting off a bag). but still hitting to the right. i'm at a loss. gunsmith time maybe, get a professional hands-on opinion?
very frustrating.

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Re: was going to ask in pm, but then

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How far to the right?
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Re: was going to ask in pm, but then

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4 or 5 inches at 25 yds. just off the edge of a paper plate. the barrel appears straight but i'm beginning to suspect i need a new one. don't want to just throw money at it. none of my other rifles does this.

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Re: was going to ask in pm, but then

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So Marlene may have other ideas, but I'm kind of left with three real possibilities.
Easiest fix- stock fitment- is the stock putting pressure on the barrel anywhere that could be throwing it off?
Bent barrel- wouldn't take much to be off quite a bit
Receiver face not true
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Re: was going to ask in pm, but then

Post by Marlene »

I think Shin's got it all covered. I'd start with the stock as it's the most straightforward to diagnose and to fix.
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Re: was going to ask in pm, but then

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ok, i'll look at it, thx.

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Re: was going to ask in pm, but then

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stock hardware to barrel fit is snug, but no pressure.
and then....
aha! headslap.
i came across this situation in a thread on another forum on page 14.
got out my dial caliper and sure enough.
the sight hashmarks on the receiver are offset to the right about 3 mm, which is about how far i've had to adjust the sight.
so, per marlene's advice in post 4, zero it and shoot it as it is, although that feels SO wrong.
i suppose i could get a smith to engrave a couple more notches on the left?

if anyone has an m1a or equivalent and wants to measure for rear sight mark offset, i'd like to know what you find. is it just this rifle, or are there more like this?

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Re: was going to ask in pm, but then

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The sight itself is mounted 3mm to the right, or the hash marks are just fucked?
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Re: was going to ask in pm, but then

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hash marks on rcvr are stamped off center. i had the opportunity to glance at an m1A (no caliper), which appears centered

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Re: was going to ask in pm, but then

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So you can click 16 in each direction for true center?
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Re: was going to ask in pm, but then

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shinzen wrote:
Fri Nov 22, 2019 7:09 pm
So you can click 16 in each direction for true center?
don't know, will check in a bit.

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Re: was going to ask in pm, but then

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Both of mine appear centered to the eye. Didn't measure them. And it might be 17 clicks, I forget.
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Re: was going to ask in pm, but then

Post by geno »

If you'd still like to see the picture of a different receiver I can dig mine out of the back of the safe later tonight, and try and see how good a picture I can get of it.
"its a goddamn impossible way of life"

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Re: was going to ask in pm, but then

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geno wrote:
Fri Nov 22, 2019 8:16 pm
If you'd still like to see the picture of a different receiver I can dig mine out of the back of the safe later tonight, and try and see how good a picture I can get of it.
sure, if it's not too much trouble. i asked on the m14 forum and one guy said 1 of 4, an armscorp is centered, the rest not so much. personally, i would find this unacceptable in a USGI rifle, but in this case, chinese, so...

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Re: was going to ask in pm, but then

Post by geno »

Mine looks to be 24/32 to the left and 23/32+ to the right.
I pinched the receiver between calipers legs and then measured in between trying to hold everything Square. This was a 4 handed operation and might not be totally precise, picture to follow.
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