From day one i have had numerous issues with this rifle. Rifle would jam, not eject. Not fire. Got first one sent for warranty exchange at my local dealer. Second one same old story, could not get through full mag. Long story short, for all my friends out there, on here. The ACTUAL problem this rifle has is the Firing pin return spring is too strong for its operation. Yes, over engineered or whatever it may be. Solution, remove bolt carrier from rifle, take out cheesy little screws with caution. A few of mine were allready stripped from factory, nvm that. Take 3 screw plate off pin cover, careful spring does not fall or twang across room. Now you will see the spring, which takes wayyy to much force to move firing pin. Ok now take 3 full coils off spring. With side cutters. Re-install spring in housing same way it came out. (Make sure metal plunger on end of spring faces same way it was). Ok now you allready have cleaned inside everything, use locktite for bolt carrier small screws. Recoil springs are Tapered so make sure thinner end goes to bolt side, same way came apart. Perfect. Now you have a rimfire rifle that WILL fire everytime. Proper strike markings on head of cartridge. Thats all you need to know. Now you can finally enjoy your Issc rifle.
Issc mk22 light strike fix.
- Thread starter Dannyboy84
- Start date
- Location
- chilliwack BC.
thanx for that!!
considering this rifle.
Any other tips? Like I hear about pins falling out and screws backing out etc?
considering this rifle.
Any other tips? Like I hear about pins falling out and screws backing out etc?
There is an extensive data base of info on another form ( us based ) over 50 pages of info .. Great read .. Naturally the above fix is one of the fixes and there are even more radical ones .. Each user will find the one that works for the lead he/she is using ..
There are other less invasive fixes one can use to start , the main one being locktite screws 108 and 108 before you use the rifle thus eliminating the opportunity of changing the tolerances of the cocking spring retainer and BCG stop while you innocently hammer off your first 200 rounds .. To bad the ISSC manual did not advise this like the RX-22 manual clearly did ( better cleaning info in the RX-22 manual also )
New units purchased should have most of the screws sealed with locktite and RRage in the US sells H&K pins for about $15.00 ( you can find them cheaper as RRage is providing three small and one large in their package ) .. These replace the two Chicago type pins that have been known to loosen on many other units that use them.
Edit: 10/12 I give a link to the US forum at the end of this post in a round about way .. I have too much respect for this forum to just directly link it as most of the info on this US forum is here , just not in one thread of 50 some odd pages .. They even joke about this form as one of the main posters tried to access out data base and was surprized he had to register before he could read ... Thanks to all the posters here that support our forum .. Great source of info .. Search button is your friend ... R
Time for the obligatory posts that ISSC should provide these pins .. Well if you are not prepared to tinker why buy a rimfire auto anyway
. Time for the obligatory ruger 10/20 auto posts .. But how were they doing 1m units ago .. Besides it is boring .. My granddad had a gun that style . And it probably cost him in 1920's $ what a MK22 is today .. ( I rant ) .. We know it would have been bolt action .. I am too OCD to put a ruger action in a black stock .. It would still have the front sights on it ...
( us site ) think of the letters before SCAR. Is it FN do they Fourm part of it's name .. Maybe check out 16 C
There are other less invasive fixes one can use to start , the main one being locktite screws 108 and 108 before you use the rifle thus eliminating the opportunity of changing the tolerances of the cocking spring retainer and BCG stop while you innocently hammer off your first 200 rounds .. To bad the ISSC manual did not advise this like the RX-22 manual clearly did ( better cleaning info in the RX-22 manual also )
New units purchased should have most of the screws sealed with locktite and RRage in the US sells H&K pins for about $15.00 ( you can find them cheaper as RRage is providing three small and one large in their package ) .. These replace the two Chicago type pins that have been known to loosen on many other units that use them.
Edit: 10/12 I give a link to the US forum at the end of this post in a round about way .. I have too much respect for this forum to just directly link it as most of the info on this US forum is here , just not in one thread of 50 some odd pages .. They even joke about this form as one of the main posters tried to access out data base and was surprized he had to register before he could read ... Thanks to all the posters here that support our forum .. Great source of info .. Search button is your friend ... R
Time for the obligatory posts that ISSC should provide these pins .. Well if you are not prepared to tinker why buy a rimfire auto anyway
. Time for the obligatory ruger 10/20 auto posts .. But how were they doing 1m units ago .. Besides it is boring .. My granddad had a gun that style . And it probably cost him in 1920's $ what a MK22 is today .. ( I rant ) .. We know it would have been bolt action .. I am too OCD to put a ruger action in a black stock .. It would still have the front sights on it ...( us site ) think of the letters before SCAR. Is it FN do they Fourm part of it's name .. Maybe check out 16 C
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