If you don't have access to a milling machine, forget it. Seriously, we used milling machines to modify the bolt shroud to take that safety. You need a key cutter to make incisions into the body of the bolt shroud. You also need to mill the bolt shroud to deepen for the shaft of the safety.
Even after modifying the shroud, we used a lathe to make a cap to cover the area above the safety (otherwise it looks like dog poo).
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Vigilantibus et non dormientibus jura subveniunt. Molon Labe!
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