How-To: Fully disassemble ISSC MK22 for repair or cleaning

F

fchan

CGN Regular
Rating - 100%
23   0   0
Location
Edmonton
By request, I have taken some pictures and put together a disassembly tutorial for my ISSC MK22. This should be enough to resolve the most common issues, however if you're facing major problems you may need to speak with a gunsmith or the dealer that sold you the firearm.

First off a quick disclaimer. I am not a gunsmith, nor is this tutorial intended for anyone who is not comfortable with the work involved. Please be safe and make sure your firearm is cleared before starting. I take no responsibility for what happens to your rifle with the work that you do on it. I'm always happy to help out if there are more questions but please don't expect me to be an expert.
Now, back on topic:

Here's what I have to start with. Pardon the mess and working space. I don't have the space for a proper work bench
I2gRkhd.jpg


A) Remove screw with flat head screwdriver
B) Same as A but this one was replaced with a HK style small push pin. now would be a good time to replace both A and B with pushpins
C) Remove hex screw and corresponding screw on the other side of the rifle
r64EWcE.jpg

D) Fold the butt stock to expose this part. Remove this screw here.
qXPCQpI.jpg

E) Without removing the butt stock you can get a visual on these 2 screws here. Typically if you are experiencing light strikes after a few rounds, these may have backed out. It is a good idea to use blue loc-tite on these guys to keep them in place
OzFVQuG.jpg
 
F) Once the butt stock has been removed you now have access to these screws. Note how it extends
past the nut. Older models have a shorter screw (M4X12). If yours is short, replace
this with an M4x16 hex head screw
MFC4Tsa.jpg


Make sure your action is closed and use a screw driver to gently pry out as shown. Keep your finger
on the other metal piece as it is spring loaded and will fly out if left unchecked.
SqhxfEf.jpg

m8Q15yj.jpg

Remove the bolt carrier group
6jQeG9t.jpg

Now we can get to the barrel for a thorough cleaning if need be.
TH6vvJZ.jpg
 
Last edited:
G) Remove the 5 screws holding the bolt carrier together. You will need a T9 hex screwdriver for this
f8OyFVc.jpg

Gently open the BGC, watch out for the springs as they will also fly out.
xdUhaXF.jpg


Disassembled
pZZIQG4.jpg

H) Use an allen key to remove this screw
GELP6MB.jpg

I) using the same allen key, press it into the hole and press out the FP retaining pin
SzK1mM2.jpg
 
Last edited:
Retaining pin removed
xdKBs0f.jpg

J) press down on the FP stop and pull out your firing pin
qls8Lpq.jpg

FP stop and FP removed
zAdbTOD.jpg

L) Remove these 3 screws with a Torx T10 Screwdriver
lHXmjdx.jpg

M) now you have access to the FP return spring. If everything is tight and you're still having
light strikes, this tends to be the culprit. You can trim off a few coils here but be careful
not to trim too many as slamfire could become a problem rendering your new toy very unsafe
0vF1oFA.jpg



Reassemble in reverse order. I find it easier to assemble the bolt upside down so the FP return spring stays in place
while I insert the firing pin. Once the Firing pin is in, all you need is that retaining pin from step H/I to hold it
in place.
 
Last edited:
JimDO said:
Where did you find the HK style push pins and is there a certain size?
Click to expand...
The HK style pushpins come in 2 sizes that Ive seen. You want the smaller one. If you look for GSG-5 HK Pushpin set there should be some out there. I have found that the US seller rrages carries them in a set of 4 for the GSG5 and will ship the pushpins to Canada. He cant send everything he stocks, but the pushpins are something that he can
 
JimDO said:
Wow great detailed post! Thanks!

Where did you find the HK style push pins and is there a certain size?
Click to expand...

I ordered from these guys: h ttp://www.robertrtg.com/g3pushpins.html

Give them a call and talk to them. Shipping to Canada was about $4.50 for 4 pins. I paid by credit card and had the pins within a couple of weeks. No hassles at all.
 
fchan said:
You can trim off a few coils here but be careful
not to trim too many as slamfire could become a problem rendering your new toy very unsafe
0vF1oFA.jpg



Reassemble in reverse order. I find it easier to assemble the bolt upside down so the FP return spring stays in place
while I insert the firing pin. Once the Firing pin is in, all you need is that retaining pin from step H/I to hold it
in place.
Click to expand...

Hmm... for the part labelled "M" when I reassembled mine, I put the plunger on the other side of the firing pin return spring. According to the ISSC MK22 exploded diagram picture, its on the side that the firing pin presses on. Wouldn't you want the end that compresses the spring to have the plunger instead of what is shown in the picture? Correct me if I'm wrong.
 
bowzy said:
Hmm... for the part labelled "M" when I reassembled mine, I put the plunger on the other side of the firing pin return spring. According to the ISSC MK22 exploded diagram picture, its on the side that the firing pin presses on. Wouldn't you want the end that compresses the spring to have the plunger instead of what is shown in the picture? Correct me if I'm wrong.
Click to expand...

Not sure. When I took mine apart that's how it was the first time. Haven't changed it since. Either way the spring gets compressed. I have noticed any issues with how this is installed. If its the other way in the diagram, I would go with that.
 
j-man said:
I ordered from these guys: h ttp://www.robertrtg.com/g3pushpins.html

Give them a call and talk to them. Shipping to Canada was about $4.50 for 4 pins. I paid by credit card and had the pins within a couple of weeks. No hassles at all.
Click to expand...

I called them today but no luck so I then emailed them...but thx for the link. Will try calling back tomorrow.

I only got as far as removing these two nuts and a few more before time ran out and I had to go to work..but so far the Anschutz looks identical to the Issc
 
You must log in or register to reply here.
Back
Top Bottom