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Well, seeing how Madbull's rails are metric, I would think it would be to convert a receiver with Imperial threading to metric for their rails.
Maybe an owner of one will chime in here. I'v only have receivers with Imperial threading, so I just buy real rails.I have used a metric thread file to rework those receivers for airsoft rails in the past.
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Age verifier Northern Alberta
Democracy is two wolves and a sheep discussing what's for dinner.
Freedom is the wolves limping away while the sheep reloads.
Never confuse freedom with democracy.
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