socom18 POI Question.

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Ace604

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Just a quick question as im feeling slightly confused. This is a socom 18.

Switched from black chinese stock to a wood usgi one. Also swapped rear sight for a garand rear sight. And a s&j hardware oprod spring guide

Rear garand sight worked fine on the black chinese stock. Now with the wood stock and new op rod guide i need to adjust the elevation to the 600 notch for it to shoot proper elevation at 50m, 100m etc. Shoots good groups once i have it at the 600 setting

No the stock is not bedded just a stopper on the oprod spring guide retainer to avoid it backing out during firing. Will be filling soon

Is this indicative of needing a higher front sight post ?

On the next trip i plan on retrofitting to the stock parts to figure out which is causing the change.

Any shortcuts or similar experiences may help me diagnose this even quicker.

I will report back what I discover on the range trip as well.
Thank you.
 
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So its shooting low when the rear sight is at a lower setting? This would mean your front sight is a tad too high. I'm unfamiliar with those Socom (navy) sights, but on the m305 some sights need to be filed down a touch.

Edit: not sure how a stock and op-rod guide change could affect this though. Hopefully others will chime in. You didnt switch ammo did you?
 
You can re-zero the back sight:

Ignoring the numbers on the sight, adjust elevation until point of impact intersects point of aim at your preferred zero distance (I prefer a Battle Zero of 250m, with the appropriate 25m sight-in target). Without disturbing the elevation setting, back off the screw on the left side of the rear sight and turn the dial so that the mark aligns with the selected distance and re-tighten the screw. You will also want to count the clicks from your zero point to the point where the sight bottoms out. If you ever have to take apart your sight for cleaning or maintenance you can reset everything to your known zero and just confirming at the range. Details here for general M14 iron sights badassery: http://www.canadiangunnutz.com/foru...-a**-with-M14-irons-sights-(and-grade-4-math)

If you are sighting for 6'oclock hold at 100m and your click count is much higher than 6-8, you may need to, as suggested above, adjust your front sight. Also note that the Garand sights and stock M1A sights are calibrated for a full length barrel, not the 18.5" SOCOMs and Shorties. Your sight radius is shorter by about 15% and so your clicks will correspond to larger adjustments downrange.

It is possible for a stock change to affect point of impact, especially if there is a change in how the stocks fit at the front ferrule. An op-rod spring guide change should tighten groups up but shouldn't affect the group centre.

I'm by no means an expert at these rifles and If I've strayed to far off the path of good advice, I'm sure someone will be along to correct me.

Cheers,
-DF
 
dflight said:
You can re-zero the back sight:

Ignoring the numbers on the sight, adjust elevation until point of impact intersects point of aim at your preferred zero distance (I prefer a Battle Zero of 250m, with the appropriate 25m sight-in target). Without disturbing the elevation setting, back off the screw on the left side of the rear sight and turn the dial so that the mark aligns with the selected distance and re-tighten the screw. You will also want to count the clicks from your zero point to the point where the sight bottoms out. If you ever have to take apart your sight for cleaning or maintenance you can reset everything to your known zero and just confirming at the range. Details here for general M14 iron sights badassery: http://www.canadiangunnutz.com/foru...-a**-with-M14-irons-sights-(and-grade-4-math)

If you are sighting for 6'oclock hold at 100m and your click count is much higher than 6-8, you may need to, as suggested above, adjust your front sight. Also note that the Garand sights and stock M1A sights are calibrated for a full length barrel, not the 18.5" SOCOMs and Shorties. Your sight radius is shorter by about 15% and so your clicks will correspond to larger adjustments downrange.

It is possible for a stock change to affect point of impact, especially if there is a change in how the stocks fit at the front ferrule. An op-rod spring guide change should tighten groups up but shouldn't affect the group centre.

I'm by no means an expert at these rifles and If I've strayed to far off the path of good advice, I'm sure someone will be along to correct me.

Cheers,
-DF
Click to expand...

Hey thanks a ton! I had the same issue as the OP, was setting the rear sight on a Dominion Arms SOCOM 18 all the way up to 600 yards, just to shoot at around 80m. Muchos gracias for the info!
 
If you were shooting point of aim or there about with the other stock with say the rear set at say 200(disregard clicks up for this 200 setting for now),..and now have to click up to 600 to shoot to the same POA, you obviously have less upward pressure exerted against the bottom of your barrel with the new stock fit. You may have even merely changed the gas plug tightness differently than before which changes your POI up or down accordingly.

If you are looking for a snug cheekweld for 200m, say 8-10 clicks up from bottom, you are going to have to lower the front sight. The proper way to set up a zeroed rifle at known distances and have the sight match the range setting is fine, however sometimes this occurs with too many clicks initially to get to say 200(14 or more), and then when trying to stretch out to 4 or 500m's, or trying to put rounds 6 to 8 inches high into a bull with 6 oclock hold at say 200,......... you'd have a very high number of clicks and likewise a high cheek weld on the stock which doesn't lend itself to good accuracy.

Hope this hasn't confused you any. It's very simple once you learn the rifle and it's sight. As stated and listed before,.. understand how to set up your Garand sight after you obtain a nice cheekweld height at say 200meters with only 8-10 up from the bottom. Get this by clicking up say 10 clicks. Set up sight as per tutorial to show 200 yards. Now fire rifle and lower front sight till you have a POI to match your POA at 200.
The shorter sight radius throws off the sight settings as described early in this post as well.

Good luck and if something doesn't make sense ask for clarification, or maybe I've erred somewhere too!
 
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