They do not have metal bushings out of the box. I would know this since I have upgraded mine and have dealt with the double feed issue also. I replaced the hop-up (bucking & sleeve) which solved the problem with the double feed.
I replaced the plastic bushings with Guarder metal bushings (which are very very nice!) along with a PDI 170.
Also invest on quality batteries. Dont let people tell you that you need to do an external battery. Just do this.
Buy one or two 8.4v Intellect 1400 Mah stick batteries. They are great cells. I haven't once ran out of juice in the field in one of the batteries, and I have not needed to use the extra battery. Also to prove this fact, I play 6-8 hour skirmishes also using a hi-cap and never ever has a battery died.
Also I dont like the standards, they dont feed that great. So I am stuck with hi-caps (which I dont like, realism wise). Although it shouldn't matter if you dont use this gun for Woodland.
Overall this is my favorite airsoft gun I have ever owned (TM AK, TM AUG, TM G-Spec, TM SOC 16 [not sure if this will be my new favorite time will tell] ... pistols etc.).
-Blink
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G&G UMG (Review available here: http://tinyurl.com/ylrqdx)
TM G-Spec
TM M14 SOCOM (Soon to have!)
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