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1. Be careful...receivers aren't all that strong and it's entirely possible to crack them
2. It's likely seized...and I'd rather cut a delta ring off than risk breaking a nice receiver
3. If soaking it with a penetrating lubricant doesn't help...then it's likely not much else will
4. You need a bit of leverage...assuming you aren't using smurf sized pliers. Also, squeezing it isn't really helping.
5. A good armorers wrench is really handy. Find a good local gun doc...he'll have one.
best of luck
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