Repairing ISSC MK22 with LIGHT STRIKE PROBLEM OR MISFIRE

Sniper22

Sniper22

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1. Take the rear stock off.
one screw at the back and a couple on the side of the receiver.
2. separate the lower and upper receiver.
you need two flat screw drivers to do this task.

The main problem of light strike is because the spacing
on the breech face. The solution is closing the gap by
installing a washer behind the bolt and replacing a longer screw
between the "Degree Angle" (#57 on schematic diagram) to
the Spring guide rod (#39)

- The Washer is to eliminate light strike.
- The Longer screw is to eliminate movement.
- use blue locktite on the two screws (#108) thread.

Image1-2.jpg
 
The job is only taking about 15 - 20 minutes max.
The result is amazing 100% fire.
You can find the washer and screw at your local hardware store.
Canadian Tire, Home depot, Brafasco or fastenall.
 
Cool! Thanks for the info. I wanted to get one of these for fun but all the horror stories stopped me. Let's see how she runs after the fix. :)
 
I have 3x sets of the screws in stainless steel (since they are very hard to find I had to buy bulk and pay the price).

2pcs x M4x16
2pcs x M4x18
2pcs x M4x12

and pressure washers (M4 HI)

pls send me an email and will discuss the price. thank you
 
I could be (probably am) wrong, but aren't stainless fasteners quite a bit softer than other steel/alloys used in screws/bolts? It may or may not matter in this application, but I'd want to be sure.
 
I can't thank you enough for this information, after the fix today I had one FTF out of 100 rounds compared to 50% FTF before the fix. I couldn't find a M4 x 16 hex key head bolt where I live so I used a regular hex head bolt, tight sqeeze to fit but it will do until I can find the right one. You would think the manufacturer would have stepped up to repair these rifles after all we paid good money for them and the pennies it cost for the repair would have saved their reputation. IMO. Fortunately there are people like you smart enough to figure it out and share the information with us.
 
my scar was working great at first, then it started the light strike issue after a couple thousand rounds. a solid cleaning and removing the mag safety and then it totally would not fire at all. after several attempts at other things i ended up installing a washer as described and blamo it worked better than before, now its at about 98% firing rate, which might just need some more tuning.
 
I also just added the washer after trying some other fixes and now it works great. 500 rounds with no issues. Thank god for the internet and people willing to take the time to post such good info!
 
Howdy,

I just got an ISSC MK22.

The Quality Control date stamped on the box was "September 2012".

ISSC has replaced the rear (vertical) socket head screw (#108) with the M4x16 as the user community suggested. Still no washer.
 
Have a better idea.

Don't buy a gun that is known to be not working and has terrible reviews for so many reasons.
 
Not sure why the hate. I don't have the washer but mine hasn't had issues. Blue loctite on the bolts from the. Factory and everything is holding fine. A lot of 22s have issues out of the box. I've seen posts about 10/22s having issues from the factory too and they're a time tested design.

They have fixed the stock and replaced the iron sights with something that locks down as well.
 
One of those rifles you need to tighten up but once you do works great. I have a 10/22 and a vtr as well and the mk22 is my favorite now by far. This fix works great, mine will eat anything I feed her now :D THANKS!
 
I had one of the earlier guns and had this same issue, after a call to North Sylva they sent me a link to this thread for the fix. Gun works great so far!
 
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