CA M15A4 TC with G&P RAS ??

[Chimera]

Hi,

A few years ago i bought myself a Classic Army M15A4 Tactical carbine.
Now, i wanted to replace the plastic handguard with a RIS so bought a second hand G&P M4 RAS. The guy said it would fit on the M15 so ok, bought it.
Now i'm heaving troubles installing the RAS on my airsoft gun..

The RAS does fit my ca m15a4 right?..
Any tips on installing the RAS?
Took my front sight of to have a bit more space to work with, loosened the screw on thop of the RAS, but no luck what so ever..

Thanks

[Chimera]

Never mind, finaly got it.
For those who are interessted in how i did it:
Needed to loosen the front sight, and disassemble the barrel nut from the delta ring.
But getting the barrel snap ring back on the barrel nut was a real pain in the a**..