I've used them a few times, but then I'm not as particular as some others. Probably not bad if the pin is not real tight, not a very stable punch though. Just use one that is smaller than the pin. I've also used spring loaded centerpunches and mini screwdrivers (improvised gunsmithing).
It's hard to drive a punch straight when you can't hit it on the centerline. Due to the bend in the standard allen wrench, you can't hit it on the centerline and it will tend to go a little sideways and scratch the finish on you firearm.
Allen wrenches are useful as punches . Cut the angle off with a hack saw. You'll find they are pretty hard. Try holding them with a pair of pliers when using them as punches. They won't take the beating without bending that a punch will but on most firarms jobs they should work fine. Hope this helps.
Unless it's a makeshift situation (i.e., in the middle of nowhere and don't have the "right" tool, so have to make do) I dislike using tools for other than their intended purposes.
Once I got out of school and joined the workforce, I still remember seeing "engineers" using micrometers as "C" clamps and vernier calipers as wrenches.
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