A standard model Colt .223 M4-type carbine goes for $1K at Wmart. For the same rifle in nice used condition, you're looking at a very reasonable $750+. A Shield will not hold value or appreciate like a Colt M4. The next shooting that causes a national panic and widespread talk of gun bans will probably not be caused by a Shield, but very possibly will involve an AR, making the Colt even more valuable.

.223/5.56 ammo has also leveled at ~.40-.50/round, with supplies becoming greater. 9mm is still tough to find in quantity.

I would trade the Shield for the Colt.

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I'm with the banned ...