I guess I am a little OCD but I keep a full size copy in my truck, a scanned full size copy as an email attachment on my smartphone and plan to shrink down a wallet sized copy as well. I figure that 99% of the time I am in my truck at the range, if not chances are good that I'll have my phone with me or at least my wallet.
I agree with the previous comments that while we may not have to show our paperwork to anyone but an ATF agent - it's much simpler to just show whoever ask to avoid a situation similar to the OP.
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