Ics m4 / 16 reciever
 

Hi there, hope this is the right place to ask this.

A while ago my ics m16 was wounded, as the full stock ripped off the receivers, breaking both top and bottom :( and my queston is, can an ics m4 reciever fit the same upper gearbox as my m16 had? I put some upgrades into that upper gearbox and my knowledge of internals was about as far as being able to take that gearbox out of the top reciever.. I wouldn't dare ever open it up.

So all I want to do is take my old upper gearbox from the m16 and throw it into an ice m4 that I my buy ( was never really into m16 anyway)

Thanks

So long as the M16 is also ICS manufactured, the components should be interchangeable. If not, the receiver will not be compatible with the split gearbox design.

Something to note: your M4 will require a ported cylinder for optimal performance. It is not likely that your M16 had a ported cylinder on account of the barrel length.

Now if I do buy the m4 and I don't get a ported cylinder will it make the gun non functional? Or will it dramatically reduce the fps? I'm not really sure what the difference between cylinders are , although I understand what it does. Are these ported cylinders something I can buy afterwards? .. sorry, I am on a phone atm and its hard to research myself

Thank for the reply too, I appreciate it

Yes, it would have a negative impact on the FPS.

Your ICS M4 will come with a ported cylinder in its gearbox. I'm merely advising you not to drop the M16 upper gearbox into your M4 without first ensuring it too has a ported cylinder.