KAC. hardware compatibility between RAS M5 and RIS M4_ tecnical question

[ineedstubby]

Hello i am creating a clone of a colt M16A4.
A guy proposed me a used M5 RAS forend rail at a good price (130 dollars), only it lacks the internal components for the front and rear coupling.
Since I have the upper part of a RIS M4 that I don't use, I was thinking of transferring the necessary parts to the M5.
Are compatible?
Looking on the Operation parts website they sell the rear kit ( KAC-KNIGHT'S ARMAMENT M4/M5 RAS HARDWARE KIT) and give it compatible for M4 and M5 while for the FRONT HANDGUAD SPACER and KAC-KNIGHT'S ARMAMENT M4 RAS HANDGUAD LEAF SPRING they speak only of M4.

Do you know if it is different?

Thank you

[Uncas47]

The top front hardware and spring look identical on mine, they install exactly the same way. The cap on the M4 is round, on the A4 it's a triangle but that doesn't matter. I recently had them off the A4 but paid no attention re installing.

[ineedstubby]

The top front hardware and spring look identical on mine, they install exactly the same way. The cap on the M4 is round, on the A4 it's a triangle but that doesn't matter. I recently had them off the A4 but paid no attention re installing.

Thanks for your response