[Kos-Mos]

You should add the ICS in the larger treads list.

However, it apparently is a hit or miss thing.

I had to install a KA Knights Armaments RIS front set on the ICS.

It was not fitting, the treadings where too large on the ICS.

So I took the VLTOR RIS (made by KA) off a KA built gun (KA metal body).

The Kights RIS fitted the KA body without issue.
And the VLTOR RIS fitted on the ICS perfectly (almost, I had to modify the lower holding section because the ICS body was larger).

Both same brand, both fitted on the KA body, but not the ICS...