Well, there's no question that the M16 is the MOST versatile.
I had decided before I got into the NFA game that if I could get two and never any others, it would be an MP5 sear gun and an M16. That's exactly what I got.
The HK sear is very versatile also, but is more expensive than the M16 platform to do it. But nothing in the NFA world is cheap. It's all relative expense.
If you start shooting .308 or other big calibers on full-auto, it does not take long to exceed the expense of the gun itself-- especially with today's crazy ammo prices.
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