Leapers, Inc. - UTG Handguard, Fits AR Rifles, 15 Super Slim, Free Float, Black MTU019SS The UTG Pro model 4/15 rifle 15" super slim free float handguard has a proprietary attachment design and an extremely compact profile. It is super lightweight with a rail at the 12 o'clock position that forms a continuous picatinny top section. It includes three user detachable 2-slot rail sections.