Received question from one of the Remington 870 owners which building LEO 870 – where to find the Remington 870 MCS forend for sale? Used or new.

Remington 870 MCS forend,

Remington 870 MCS forend,

I was able to find it on Remington website.

with Parts Price List (pdf). Searched inside and found following forend:
F403318 V-27A 870 FORE END 12 GA SP SYN BLK MCS (MCS ONLY – NOT INTERCHANGEABLE WITH OTHERS) $36.00

So you also need Remington Forend Tube Assembly designed specially for MCS.