That Apache 77 is a green clip fed version made for K-Mart. The Apache Black was the black and chrome tube fed 66. The Nylon 11 was a bolt rifle and used a different mag. Mags are still made for the 77.
Here's a quick primer on them in case anyone is interested.
Remington started making 66s in 1959. The name comes from the zytel plastic which was made by Dupont who owned Remington. That plastic was called nylon 66. They were very unique and decades ahead of their time.
The 66s were all tube fed through the stock rifles. Remington also made three different nylon bolt actions a single shot called the Nylon 10, a detachable mag version called the 11 and a tube fed under the barrel version which was the Nylon 12. They also made a lever action called the Nylon 76. The basic 66 was brown, the brown being called Mohawk Brown. One early and somewhat rare color for the stock was called Seneca green. They also made a black and chrome 66 called the Apache Black. A black stock with blue steel version came out in the 1980s called the Black Diamond. The diamond was black instead of white.
In 1970 Remington came out with brown detachable mag version called the Nylon 77, changed the name in 1972 to the Mohawk 10C which came with a 10 shot "clip". It was made until 1978.
The tube fed 66 pretty much ended production in 1987 but Remington resurrected the "clip" detachable box mag fed rifles exclusively for K-Mart. Instead of a brown stock it had a black matte finish on the metal, and a green stock with a black diamond. It was called the Apache 77. K-Mart sold them from 87-89.
If you have any questions about what you have let me know. I collect them and have a lot of info on them on my web site.