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I decided to mod the plate that houses the valve knocker as I didn't want to risk damaging any RS parts (especially the upper receiver), and besides stock WE parts are more accessible. I could easily manipulate the plate from any angle using a table vice grip and make the necessary relief cuts to accommodate the RS upper receiver. Also, you need to either mod the "wings" on the hop up chamber or the neck of the RS upper since there is only one cut at the 12oclock position. You need to ensure that the hop up chamber does not rotate in the upper receiver or else it will break the front end of the nozzle when it returns to battery.
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