Lets have a reality check. Its the same damn screw for all gunfighter grips and a2 grips
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A screw installation tool makes it easy.
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My PSAs all came with the vastly superior and highly preferred allen grip screw. Definitely recommend deep sixing that slotted garbage. Which is exactly what I did with my Colts (screws).
So the OP Cane55 has not only asked what screw driver to use here, but also on TOS.
Taking the screw down to the local hardware store to find a screw driver that fits apparently eludes him, and he's willing to pay more than $6.00 to buy one.
Of course I told him on TOS to go to the local hardware store to buy a SS ¼”-28 x 7/8” Allen head screw that takes a Hex Key Size: 3/16" and should cost him less than $2.00.
But no, he's still trying to find a screw driver that fits on two forums.....SMH
So lets go arfcom route instead of getting him the right bit for any USGI spec screw...
Okay then
I suggest taking the lower receiver to a local gunsmith to have them replace the grip. The use of the incorrect driver will surely damage the screw beyond repair, and render the rifle inoperable.....just not worth the risk.
Lol wut? Take it to a gunsmith? We're talking about installing a pistol grip.
Yep, a task that seems to be rather difficult for the OP to accomplish.
Seriously, if the OP doesn't have a variety of driver bits, buying a set of different sizes that also includes Torx and Phillips would be a much wiser purchase than one bit or screwdriver. Naturally, a bit driver that's long enough to reach the screw will also be needed.