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Is it really small, like how big would a M1a1 Abrams be in inches?
The hull of my M1 Abrams kit is 4½" long and about 2" wide. The gun tube over the front stretches the tank out to a full 5" long and hull and turret are 1½" tall (not including antenna).
I would suggest you buy the Revell M1A1 Abrams kit. It runs about $10. Not a lot of money for a pretty decent kit. It builds into the most common variant used during Desert Storm.
The Dragon Abrams kits (M1A1, M1A2 and M1A1 w/plow) were rather disappointing because they were based off of Dragon's motorized Abrams series. They run about $10 as well. They build into Desert Storm and OIF versions (the M1A2 does not build into either though).
Also the Italeri (ex-Esci) M1 Abrams is a decent kit, but is around 20 years old and represents the initial M1 Abrams before any production modifications. It is around $8.
If you click the "Braille Scale" link in the armor forum, you will see the 1/72 scale related topics.