Very solid, sturdy and reliable, before and after the upgrade. This gun, in its original form shoots awesome, but my upgraded version shoots better than a $300+ AEG. My gun, dubbed the 'Parker Industries DMR' shoots at 510fps with .25g bbs. The gun shoots to about 250ft out and it's known for headshots at that range more than twice. It's ROF is average and everything else is amazing. Totally worth it and it has proven it's self over and over.