The Midwest Industries Forearm Light Mounts. Short Forearm Light Mount: Mounting hardware included Will fit AR series handguards with large or small holes Hard coat anodized 6061 aluminum construction In most circumstances you will be able to use standard heat shields after installation WILL NOT FIT GEN2 SS HANDGUARDS. Weight .7oz Long Forearm Light Mount: Mounting hardware included Will fit plastic "GI type" AR series handguards with large or small holes Hard coat anodized 6061 aluminum construction In most circumstances you will be able to use standard heat shields after i Mfg: Midwest Industries