Custom Post Type Replace the_content() in loop

Hi everyone,
What is the best way for replace the_content() in the loop for certain custom post type?

i wrote this code

add_filter('the_content','the_content_filter');
function the_content_filter($content) {
global $post;

if ( $post->post_type == 'my_custom_post' and is_single ( ) ) {
$$content = get_template_part('ri_template/ri-single');
} elseif ( $post->post_type == 'my_custom_post' and in_the_loop() ) {
$content = get_template_part('ri_template/ri-loop');
} else {
return $content;
}

}

what is the best way for replace the_content()?
Thanks in advance!