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- The WE M4 is based off the 5.56 AR-15, so you'll need a 5.56 rail, not the 7.62 rail. The barrel extension on the AR-10 type rifles is larger AFAIK.
- The barrel nut is AEG spec, not G&P/WE/RS spec. You'll need to buy either the RS nut from Daniel Defense or one of their licensed suppliers, or find Madbull's G&P nut. This may have changed recently, but that's AFAIK.
- No gas tube hole: Not necessary, but I find it important none the less for aesthetics since it's necessary on the RS. Could always drill your own.
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