ISSC mk22 & GSG-15 Full Monty disassembly & field stripping for cleaning. Rifle 22lr

The Trigger and Bolt disassembly are separated from the Full Monty Disassembly and was done at a later date, see end of screen.
The Mk22 and the GSG-15 are the same, except for the stock.
Note: the bolt and FCG in GSG-16, GSG-15 and ISSC mk22 are interchangeable.
Correction: I inadvertently said the back screw, screws to the bolt when it actually screws to the charging handle spring guide rod.
Disclaimer: this video is for educational purposes only, free of charge. Any part you copied is at your own risk and should be inspected by a professional prior to use.
Due to KZbin's policy. Please do NOT ask for link or post information of where to buy.
Please do not attempt to do my disassembly because it's not made for novices who can't figure out what I'm doing on or off camera also quite often due to the length I don't reassemble or include the FCG which is done separately.
If you like what I do on KZbin and you found some parts useful then please support my channel by pressing the LIKE and the subscribing buttons. If it was of no use to you then thanks for watching and please press next. Making videos are time consuming and not to mention expensive to do... Thank you.

[@XxnosmanXx]

Thanks for these detailed disassembly videos of ISSC/GSG firearms. Great job and very helpful since there isn’t much on KZbin.

[@gnutzguy]

ya welcome.

[@yongli7181]

i have one. so your video is very useful to me. I like your video. Good job.

[@productdevelopers]

Thank you for this video. I'm getting ready to paint my mk22.

[@gnutzguy]

ya welcome.... cool, what color?

[@wavular]

Would be nice if we could have seen more at the beginning with the bittstock on which screws and pins you mean.

[@pietrobiggio9824]

Thank you for this useful video. But don't understand how to reassemble the bolt stop spring. Can you help me?

[@juanreyesdiaz7848]

My goodness, how many pieces seems like a lot

[@gnutzguy]

tell me about it. lol. and i havent disassembled the FCG yet in the pic. lol.

[@JohnSmith-ir6bc]

@13:30 This stupid pin removal hole is a huge flaw in the design of the rifle. If you are too rough with your drills and cock the action too aggressively, it is possible to kick this little pin into this hole and either cause it to slip behind the bolt carrier - which it alone actuates - or even bind up the entire action until you wiggle everything just right to get it to drop back down (assuming it hasn't slipped all the way out under the rail and become hooked on the side of the hole). A little solid spacer to fill this hole while the gun is fully assembled would solve this problem, but apparently the Germans designed this thing to be handled with kid gloves at all times. Do yourself a huge favour and go to a hardware store, find a 6mmx3m screw nut (or a 7mmx3mm and do a little filing) and plug this damn hole on reassembly before you have a hard stoppage in the middle of a competition as I did before I figured this out.

[@gnutzguy]

yes, the pin could possible move up and jam the action but its prevented from moving any further by the rail above it.

[@JohnSmith-ir6bc]

@@gnutzguy All I know is I had to buy a large set screw to just leave sitting in the hole to prevent it from jamming if I'm too wough wid it's poow widdwe chawging handwe. My point being, as much fun as I have with this gun, whoever let it go to market with such a critical flaw needs a smack upside the head. Good video because it's the only full monty disassembly I've found, but anyone interested in this gun needs to know its flaws.

[@gnutzguy]

@@JohnSmith-ir6bc absolutely, that's why you and I are here to inform the gun community of its flaws but I find gsg usual dont do anything about it, leaving us to rectify the problems.

[@AlbertaClimber]

@@gnutzguy I'm not sure what the pin would catch on. Maybe the thread inserts for the sight rails? They do protrude maybe a 1/64th of an inch, but you would think that if the pin had become that loose, gravity would do it,s thing and the pin would drop down until the head prevented it from going further. I had to tap mine out, so I doubt it will be a problem, but I am sure that a drop of thread-lock on the pin before inserting it would eliminate the possibility of it moving.

[@MrGoofySir]

Is it possible to get a threaded barrel for a suppressor attachment ?

[@gnutzguy]

yes, but you need an adapter from the skin barrel to 1/2x28.

[@randyschaff8939]

I am getting soft strikes on the rim. ( use) No owners manual. Can you get new firing pin? OUTSTANDING ACCURACY! I plan on keeping it. Getting too many mis fires.

[@gnutzguy]

before you change the firing pin, flip the brass retainer at the bottom of the hammer spring and see if the number soft strike lessen.

[@shannonreid6992]

I am also getting a lot of soft strikes on my gsg-15. This past weekend it was every second round. I cleaned it very well before using it. It seems like these gsg-15’s are known for it. My gsg-16 has been a much better gun

[@haywoodchablomi8037]

Overly complicated Euro rimfires. This Cerakoter thanks you.

[@gnutzguy]

You're welcome

[@TonyStark-pi3vc]

How easy is it to remove the mag safety? I'm experiencing light primer strikes every other shot. Only have about 1500 rounds through it.

[@gnutzguy]

you dont have to remove the mag safety. i explained in the vid how to disable it.

[@TonyStark-pi3vc]

@@gnutzguy ok my bad I must have missed it. I’ll watch it again.

[@wavular]

At the beginning of the video don't you mean the mk 22 and the (Gsg 15? Not 16? That are the same except for the buttstock? Correct?

[@FC-ue1yc]

Geez, I thought Savage 64 was bad enough to take apart until I see this

[@gnutzguy]

Yup and very good chance of stripping the threads on the receiver.

[@surrival1979]

Nice videos! Also, for the type 81 LMG, how much is the barrel too thick for a Magpul handguard? Can it be widened reasonably somehow or something done at a gunsmith?

[@gnutzguy]

nope, the barrel is way too thick for the clamps.

[@surrival1979]

@@gnutzguy That's a bit rough. I was hoping to get an LMG and try my options.

[@gnutzguy]

i will be doing a pimp me shoot on the lmg early next year so stick around.

[@surrival1979]

@@gnutzguy Oh, you bet I will!

[@djmkultra]

@gnutzguy Do you have a parts diagram?

[@gnutzguy]

i dont bcos its in the gsg-15 manual. get it online.

[@lemonstealinghorsdoeuvre]

I just got a scar for $100, because it was completely disassembled and driving its owner insane. I kinda feel like I got ripped off

[@gnutzguy]

Lol. And if you can't put it back together then sell it to me at your cost and i promise I won't feel the same cos I will doing the happy dance, lol. 🕺🕺🕺🕺🕺

[@lemonstealinghorsdoeuvre]

@@gnutzguy it's going to happen. The first step was learning this was a issc mk22. Step two is curse the portals the springs use when they fly to another dimension. Step 3 is to blame them for not giving the springs with the rest of the parts. 4, bring it to the local gunshops and get a $50 per hour quote and the recommendation of just working off youtube videos to try to see all the tiny parts only a fool would take out and aren't mentioned. 5, get distracted with comments. 6, buy a Type 14 Nambu. 7, forget about the issc and sell it to Gnutzguy and just use the Sig 522 for plinking. Wait a minute... that doesn't look like I complete it even if I follow the plan. Cross your fingers for the Nambu on Monday though.

[@lemonstealinghorsdoeuvre]

I did it. I have 6 springs, 2 screws, 4 pins, 2 lever arms, 3 washers, and one _D_ shaped ring left over and those were obviously extra, but the darn thing is cycling and the action works, so I'm calling it a victory. Seeing it and holding it as is, it's ugly and bulky. I bet if it were in good order, it would be a lot of fun, especially with a bipod. But I'm spoiled with the 522, it's not easy to beat.

[@gnutzguy]

but 522 cost sooo much more... congrats

[@jimmysedano1872]

I bought an m-15 22lr for fun. Which it is, but damn this gun is a pain in the ass to clean. Like just do a field strip takes a lot of work for this specific gun lol 😂

[@MrStriker351]

On ne voit rien....

[@gnutzguy]

C'est étrange

[@OldToby53]

unnecessary in taking apart the whole firearm...this will create frustration and waste of time

[@gnutzguy]

lol, you are missing the point. the purpose of my full monty videos are to alleviate frustrations and not take it to a gunsmith bcos a spring fell out.

[@TheRealBatCave]

U could just stop at the 1st 7 min of the video, he explains at that point thats the extent of the field strip, just clean and reassemble, after the 7 min mark its just extra information if u wanted it

[@haywoodchablomi8037]

Well this helps someone like me who does Cerakote and needs to strip the entire gun too.

[@cjf334]

I hate this gun its too much to clean

[@gnutzguy]

LOL. while other hate it for lack of reliability.

[@justinlee_97]

This firearm is designed in the pattern on a BB😂, it’s not designed to be a firearm