AFAIK that’s _not_ the case. I’ve heard many FA owners state they’re for full & immediate repeal, even though they appreciate the investment opportunities; never heard of one actually oppose repeal with any form of “got mine, screw you”.
The only value of “got mine” at this point is investment. Actually using one risks damage/destruction, to wit catastrophic loss of investment. One antique M16 vs 25 modern machineguns (M16, M4, P90, HK7, etc) for the same price? latter is much more fun.