Over time, the back of the sheet metal of the magazine gets compressed from being inserted. As Peter mentioned the back might be bowed in a little bit. Quick fix that needs three hands.
Take the mag, remove the platform and spring, flip it onto its spine and position it on the bench on two slats of wood to support it at the sides on the outer edges. Then make a hardwood drift that will fit inside the body and position it to push the back of the mag back outwards. Using a precision 8oz instrument hammer, give it one little tap and try it in the rifle.
Give it another tap and keep going until it will lock in solid. It doesn't take much to push the sheet metal back out, the most difficult part being juggling everything on the bench, it will be fun.
A lot easier to do if you can get somebody to hold the thing while you work the hammer and drift.
Works like a charm, I tighten up my mags as a matter of course. It might sound good when presenting arms, but I hate a rattling rifle.
And I have a feeling that this is going to make me smile....Peter, what is a 'blanket stacker'?Information
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