LCS SK-19 grip

Does anyone know if the handgrip on the SK-19 is a standard AR? I’ve seen images of the gun with what appeared to be a different grip then what is on mine. I like the stock grip for bench but for field carry and shouldering I think I want something straighter. 
Any help is appreciated! I was going to remove the grip from my AR but was discouraged after seeing a flathead fastener. Rather leave it mint and unmarked and without the proper tool at the moment.



Thanks!