I was disappointed when I shot my lightweight/youth rifle in .223 @ 100 yards several weeks ago. Shots "sprayed" more than grouped. After listening to some of the experiences of the wise ones on this site, I played a bit with the forearm. The socket in the forearm was a tight, press fit onto the (female) threaded post welded on the barrel (to receive the forearm screw). I grabbed the dreaded Dremel and relieved that "socket" so that the post slides easily into the forearm and then dropped an appropriate sized "O" ring into the bottom of that socket. The end result is that the barrel is sorta "freefloated" (except, of course, for its contact with the "O" ring).
Preliminary testing looks promising with two, back-to-back shots inside of an inch @ 100 yards with one of my favorite handloads. The lightweight barrel heats up VERY fast and I didn't have time for a more thorough test (allowing time for complete cooldown between shots). I think the little rifle may be showing promise.
One other thing I notice is that its diminutive size, while cute, makes it considerably more challenging to shoot well. Weight isn't always an enemy, is it!