That's going to be IMPOSSIBLE to find. Practically all Scar are prebuilt and build kit simply does not exist. You can't "build" a SCAR because almost all the parts are proprietary. The closest you will get is customizing the existing scar. Keep an eye out on G(un)B(broker). They have A LOT of Scar parts available right now. Another place is here ( midwestgunworks.com/fn-scar/parts.html ) hope this helps!

Darryl, this is about as rare as hens teeth in the current market Sir. I would check on large gun and accessory sites like (6)un (8)roker as discontinued and hard to find firearms and accessories show up for sale by private individuals and small shops. Just replace (6) & (8) with G & B. I would also check for SCAR 17 parts here as well : -- midwestgunworks.com/fn-scar/parts.html