If i go with Vodnik's advice, you really need the armorers wrench AND the plastic vice stand for uppers to do a safe job on any uppers. the stand is not expensive and well worth it for PTW owners.... cause with that wrench, its quite easy to over torque!...of course you have to use caution when applying force...(usually i put my hand as far up the wrench as possible to avoid over stress)
Armorers Wrench
Plastic Vice Stand
i know this is late.. but for anyone else thiking of doing any kind of work!
hope this helps.
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Raven, Team Bad Karma (01), PQAC
Do not mistake activity with results!!