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Nylon 11 parts
Can't tell you for sure about the 511 vs. Nylon 11 but I believe the difference between early and late in the 513 (all have the same receiver housing but may have different holes ) is the early magazine retainer mounts with machine screws to an alluminum block in the receiver and the later one mounts with wood screws to the stock. Magazine is the same for early and late. Also, unless you have lots of patience and are good at adjusting magazine feed lips, stay away from aftermarkets with an Ron the bottom... they will drive you crazy. I have about 5 of them in both 6 and 10 round and not one of them works with any of my 51X series.
Can't tell you for sure about the 511 vs. Nylon 11 but I believe the difference between early and late in the 513 (all have the same receiver housing but may have different holes ) is the early magazine retainer mounts with machine screws to an alluminum block in the receiver and the later one mounts with wood screws to the stock. Magazine is the same for early and late. Also, unless you have lots of patience and are good at adjusting magazine feed lips, stay away from aftermarkets with an Ron the bottom... they will drive you crazy. I have about 5 of them in both 6 and 10 round and not one of them works with any of my 51X series.