This is a picture of all the parts that come with the Animal Motor Works Green Gorilla K670.  It includes (2) O-rings, (2) Snap Rings, (1) Washer, (1) Graphite Nozzle, (1) Forward Closure, (1) Phenolic Liner, (5) Propellant Grains, and (1) Aluminum motor casing.

The first step is to apply a light coat of grease to the two O-rings.  Already this is easier than an Aerotech reload because both O-rings are the exact same size, no need to figure out which one to use first.  After they are greased, one goes on the forward closure and the other goes on the graphite nozzle the same way.

The next step is to apply a light coat of grease to the inside surface of the casing at both ends.  Next you slide the graphite nozzle into the end of the casing that has the external thrust ring followed by the washer as shown here.  The nozzle does take a little pressure to get the O-ring into the case.

Using a pair of snap ring pliers you install one of the snap rings to hold the nozzle and washer in place now.  Both snap rings are also the same size. A good pair of snap ring pliers will make this step a snap.  Since the snap ring could pop out while trying to insert it, it is a good idea to wear eye protection.  I did not have any problem with this on   the two motors I assembled.

The next step is to load the 5 grains into the phenolic liner, and then slide the phenolic liner into the motor casing.  You will want to grease the outside of the phenolic to make it easier to clean the motor after it is fired.  I also found it easier if you remove the "born on" sticker from the grains.

One more snap ring and you are done.

This is a picture K-670 in the back of my AMRAAM.  It shows that motor retention can be done easily with a simple hook.  The exposed part of the motor is an aluminum casing, and a metal snap ring and washer.  I was concerned about damaging the graphite nozzle with my motor retention, by I soon found out that this was not an issue.