Sounds like a good buck.
Regarding weight, and looking back over our records, the heaviest muntjac weighed a shade over 16 kg, which is 35 lbs. This was gralloched but head & legs on, so you can probably drop a kilo for tghat.
We've shot 139 muntjac that weighted 12.25 kg/27 lbs or more since 1997.
The average weight of the 1,152 muntjac that we have shot and that we have data for over the same period is 9.58 kg, or just over 21 lbs.
These were all shot in West Berkshire.