Looks pretty good. Couple corrections though. On the left side, you have the tires switched. The center hub with the bar across it is the rear hub. You have it correct on the right side. Also, your Mk 19 rounds are painted in reverse. The casing should be a steel-greenish (parkerized?) color with brass bullet ends . Looks like this:
Rear tow pintle looks AWOL too.
Looks like a good, solid build. Couple minor corrections and it will be great. Good job.