"To enhance my firearm collection."
Personally, I've never filed a Form 4, but I've filed four Form 1's.
On those, I've used:
"For mechanism development" (Haven Mark I SMG)
"To enhance my collection of WW II weapons" (MG34)
"For system research and development" (Sionics can)
"For mechanism development and to enhance my firearm collection" (M-10)
All were approved.
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