In estimating weights. everyone seems to forget quite a few "extras"...

Extensions, zip ties, shrink tube, control linkage, foam padding, tanks & plumbing, fuel dots, decals, epoxy/CA etc...

While it may seem minimal, it all adds up (extensions alone can add up quick) as many as 8 can add up to 8 oz... 1/2 lb.

I've seen the same plane weigh differently as much as 1/4+ lbs coming out of the box. It's also reasonable that scales could be off by that much too...