My ISSC MK22
- Thread starter fchan
- Start date
My final range report now, after having the total 4 springs chopped and removing the FP stop and magazine release safety I took it out to see how it runs. I was using Federal AutoMatch in bulk packaging. I was not cherry picking which video to upload, I only took 2 videos. First one is with 1 mag. Second one is after I saw the first one, adjusted how I used my phone to take the video and ran 2 mags through it. I also changed out to an AR muzzle brake I had around just for fun. I ended up putting a couple hundred rounds through this today with zero issues.
All I can say is that this thing is a TON of fun! It was hard not to run it fast at the range. I'm very pleased with how things have turned out and this thing is going to see many many more rounds
Great thread and nice setup on the MK22. Is this the SPFGA range that you're at?
So, according to the diagram, the firing pin spring is part 92... it looks like it has about 7 or 8 coils. I'm supposed to remove 4? Basically cut it in half??
Edit: Maybe that drawing in the diagram isnt exact... is this the piece? (post 356) http://fnforum.net/forums/fn-scar-1...sors-scopes-acessories-etc-36.html#post303622
Damn... well, I tried to get at the BCG to modify the firing pin spring, but the two hex screws on the side that hold the folding stock in place are stripped :/
Any idea the best method to get them out?
I'll also need to buy replacements, are these common screws?
part 64 - DIN7991 M4x10 screw
Any idea the best method to get them out?
I'll also need to buy replacements, are these common screws?
part 64 - DIN7991 M4x10 screw
Damn that sucks. How did you manage to strip it? Any pictures?
Something like This might help but pictures might give us a better idea http://www.canadiantire.ca/AST/brow.../Mastercraft+Screw+Extractor+ 5.jsp?locale=en
I'll also post some pictures up later with the bcg disassembled so you can see which spring needs a clipping
Something like This might help but pictures might give us a better idea http://www.canadiantire.ca/AST/brow.../Mastercraft+Screw+Extractor+ 5.jsp?locale=en
I'll also post some pictures up later with the bcg disassembled so you can see which spring needs a clipping
I probably over tightened them :/ It's part 64 - any idea if this is a common piece i might find at a hardware store?
I might just take it to a gun smith, probably won't cost too much, rather have it done properly. I was gonna use a dremel and cut myself a slit to use a flathead screw driver, but I dont want to mistakenly cut into the chassis.
Also, thanks - any additional pictures of the bcg disassembly would be helpful, I dont think I've seen anywhere how how to do it.
I'll start a new thread and title it appropriately. As for the screw, you may want to check your local nut and bolt supply store. It shouldn't be too hard to find and if you bring one in they should be able to help you out.I probably over tightened them :/ It's part 64 - any idea if this is a common piece i might find at a hardware store?
I might just take it to a gun smith, probably won't cost too much, rather have it done properly. I was gonna use a dremel and cut myself a slit to use a flathead screw driver, but I dont want to mistakenly cut into the chassis.
Also, thanks - any additional pictures of the bcg disassembly would be helpful, I dont think I've seen anywhere how how to do it.
Fchan, I think we need to consolidate all the ISSC MK22 knowledge into its own website... so much information on the fnforum, and bits and pieces on here - it's hard to keep track of the "proper" do's and don'ts.
An update on the screws and firing pin spring. I think my biggest mistake was assuming the hex screws were SAE... Im somewhat new to gun tinkering. Went out and bought a metric set, got one screw out no problem. The other one I got out drilling into and then using a No.2 size Screw remover like you had suggested. I then dremelled slits to use a flathead screwdriver. For now, everything is fine. I'll head to my fastener supply store this weekend. I figured out how to get access to the firing pin spring and clipped four coils off. Man, is this thing over designed... makes my 10/22 look like the most minimal thing in the world A real pain in the ass, but I learned a lot about the internals, and everything is feels better now. I'll goto the range tomorrow to confirm. I believe the previous owner had mistakenly put back together two of the mags - the bolt never held open on the last round. Flipped around the spring in one, and turned around the follower finger grip on the other - both now work as intended.
I hope giving it a good cleaning and doing some of the mods will improve my performance.
