This is the first model that Classic Army made before the X-Series were upgraded. Pulling back on the charging handle does nothing but make a cool sound. On the X-Series, pulling back on the charging handle will lock the fake bolt to the rear (well 1/4 to the rear) to all access to the Hop-Up.
It's a direct replica of the infamous XM177E2 carbine that was used by many Special Operation Forces during Vietnam in the late 1960s up to the Gulf War and Somalia before the M4/M4A1 replaced it.
Members of the US Army Special Forces (Green Beret) with Local Vietnamese
US Air Force Security Policeman during Operation Desert Shield
It features many of the M16A1 body such as the Upper and Lower receiver and the pistol grip. It has A1 pistol grip that doesn't feature the finger groove that is on the A2 grips. The Classic Army replica has a 10.5 inch outer barrel with the unique X177E2 muzzle break that measures 4.5 inches. The muzzle break seems to be part of the outer barrel, so there are no -14mm threads for other flash hiders.
You can attach a rail platform on the carry handle for range sights (ie red dot sights or scopes). Or you can attach the better looking older 4x20mm AR Scopes for authentic looks.
The sights on the XM177E2 seems to be just two peep holes. One shorter than the other.
A shorten high cap magazine that holds 190 bbs was included in the package. There are spring loaded Mid-caps available by G&P, MAG, and Tokyo Marui.
Due to it being an M16 platform, the gearbox is a version 2. I'm not a big internal expert, actually I don't know anything about internals. I like to keep my internals stock of the manufacturer's gears. The only upgrade I'll be getting is a tightbore inner barrel.
Overall I like the replica. I've desired to get one for about 3 years to do a proper Vietnam LRRP loadout or just to have one in my collection. I haven't tested this AEG out on the field. The older AR platform has gain my interest over the recent months.
Unfortunately there aren't a lot of these Classic Arms replicas being sold new in the box in major airsoft markets. Classic Army has been rather quiet nowadays, so I don't know if they officially discontinued the model or having some sort of problems with productions or being sued by major American and European companies. G&P has released news of their XM177E2 models coming out soon, one that is just the carbine and one with the M203 40mm Grenade Launcher. These are going to be off the shelves like hot cakes.
Hopefully I can keep this a little longer than my other airsoft replicas.