A buddy brought his 416 over the other night...two body pins, 1 fore end screw, 1 barrel nut, 1 chamber screw and the whole upper was apart the crud picked out of his chamber.
In the same 5min of doing that...I would have barely have gotten the grip off an M4 AEG.
That's the ease of working on a GBBR vs. an AEG.
All airsoft stuff needs maintenance. If either platform is working well...then it'll just need it a whole lot less frequently. But with both platforms gremlin guns are just PITAs.
Most reliable...it comes down to the mags and how they interact with the gun (ie knocker/nozzle/etc...).
Some systems have inherent weaknesses...more design flaws than anything.
With regards to "upgrade" parts....I have a bag full of CNC steel hammers/sears/knockers/etc... None of them get used because they aren't really needed. Beware of mixing in parts between brands.
I'm fully convinced that a little "slop" is a good thing with GBBRs.
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