Great choice for 9mm build! - Guntec USA Ultra Lightweight Thin M-LOK System Free Floating Handguard w/ Monolithic Top Rail

I will say for the limited number of 4 inch free floating handguards available this is the BEST balance between cost & quality, The fit and finish are great and the price range (50-$60) is on point especially since it's manufactured in the U.S.A. I paired this with one of the GUNTEC USA stripped dedicated 9MM billet uppers and it is every bit as solid and pleasing to the eyes as any build I've done AND at a much more reasonable price point too.