Hi there and welcome to the world of 64s. You're right about the magazines fitting poorly, especially those of older vintage. I got some about 3 years ago and the work much better than my older ones. They still were a bit loose so I put a dab of JB-weld on the backs to tighten them and it worked well. I have several threads about mods, both here and on RFC (where I saw your post too), detailing several 'fixes'. As for the last shot issue, I just load the mag with a snap cap as last shot - 9 is plenty till the zombie squirrels attack !! Your thought about putting a block on the follower prob would work well, but as for cutting and stretching the spring I did that on one of my older mags to ease loading. It left the follower feeling 'loose' tho it works OK, so if you try that go gently with the snips ;-) I haven't seen any threads anywhere (I've had my 64 for about 8 years) so no quick fixes I guess.
I just want to mention the trigger pull as it's pretty stiff - around 5-6 lbs - and there are easy fixes. MCarbo has a spring kit for about $15 or so which I bought. I only used the Sear Spring as it's a complex coil-y thing. I used 1/3 of a clik-pen spring and stretched it to fit in place of the OEM spring - much lighter than the MCarbo replacement. My trigger is down to around 2.5 lbs. Further, I polished the 'release face' of the Sear as well as the sides to reduce friction. I find that .22 ammo is pretty dirty so I run the internal action completely dry - makes less of a mess when you open it up and very much oil/lube will slow the action anyway. Keeping the bolt 'oil-free' is important as the firing pin is 'floating' and oil + dirt can cause it to hang up, leading to FTF.
Finally, I just want to say I'm NOT a gunsmith, 'just foolin' around' , so use caution and common sense if you try ANY of these suggestions.
Regards,
Ed
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