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Old Marui M4s, I think all GBBR M4s? and systema PTWs swing apart
Some older plastic guns had thin tabs to try to emulate the real steel method as best as possible, but those plastic tabs were pretty weak, I think everyone switched to the sliding method for AEGs.
A PTW and most GBBRs replicate a real steel receiver where the upper receiver has a sturdy crossmember for the rear body pin to hold the receivers together, obviously if there's a mechbox in the way that tab can't be there. This was solved with the sliding receiver whereas the rear buffer tube area that mates with the upper has a lip or pins to lock the receiver halves together.
The sliding method is the strongest way to keep the two halves together with a mechbox in the gun
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