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mcguyver · May 21st, 2006, 18:28

On an ICS MP5 mechbox, the summed area of open "holes" in the mechbox would be at best 1/4 of the cross section of the cylinder. They don't give you very much to work with. The head set was a ported upgrade "silent" set from ICS.

Nearly all manufacturers I've run across who make an M4 use a full cylinder. Marui and ICS so far are the only ones I can recall that do any barrel/cylinder volume matching. G&P, G&G and the one Classic Army I worked on were full cylinders, but also they use reinforced mechboxes with the "window". They also all had ported piston heads as well vs. Marui and ICS which do not.

I would suspect that the porting will also allow for a quicker seal between the piston head o-ring and the cylinder wall as well. As pressure increases in the cylinder during compression, the o-ring will be forced outwards due to the ports in the piston head. This seals up the cylinder very quickly. I've observed this by quickly vs. slowly cycling the piston on my bench with the nozzle sealed.

May 21st, 2006, 18:28	#8
mcguyver Trader rating Join Date: Aug 2005 Location: Northern Alberta	On an ICS MP5 mechbox, the summed area of open "holes" in the mechbox would be at best 1/4 of the cross section of the cylinder. They don't give you very much to work with. The head set was a ported upgrade "silent" set from ICS. Nearly all manufacturers I've run across who make an M4 use a full cylinder. Marui and ICS so far are the only ones I can recall that do any barrel/cylinder volume matching. G&P, G&G and the one Classic Army I worked on were full cylinders, but also they use reinforced mechboxes with the "window". They also all had ported piston heads as well vs. Marui and ICS which do not. I would suspect that the porting will also allow for a quicker seal between the piston head o-ring and the cylinder wall as well. As pressure increases in the cylinder during compression, the o-ring will be forced outwards due to the ports in the piston head. This seals up the cylinder very quickly. I've observed this by quickly vs. slowly cycling the piston on my bench with the nozzle sealed. __________________ Age verifier Northern Alberta Democracy is two wolves and a sheep discussing what's for dinner. Freedom is the wolves limping away while the sheep reloads. Never confuse freedom with democracy.