For The “Just as good” File. (When “Just as good” Really Isn’t )


The back fell off.

A friend sent me these last night. Some one told me that the parts that failed are made by the Internet’s favorite AR maker but I have not confirmed that yet. It sure wouldn’t surprise me if it is. My other guess would be Stag Arms. Their amazing charging handles have really impressed lately and I have seen dozens of stag guns over the years fail in various ways.

The back of the receiver extension or, “buffer tube” to use common parlance , let go under recoil and the rear movement of the BCG forced the spring out the back and breaking the MOE stock. Which also makes one wonder about the quality of those.

A Colt employee commented to me after being shown the picture that the standard milspec M4 stock will stand up to this if the buffer tube fails. The stock will allow the gun to continue to function assuming the break is covered by the stock. He mentioned the MOE stock being one of the stocks the military will not use on rifles/carbines. Not strong enough.

I been trying to track down the owner of the rifle because I am dying to know how it felt when he fired a shot and that spring came out like that. It looks like it had the potential for injuring the shooter.

I was talking to Brent from The Colt AR15 Resource last night about this and offered up a p half joking prediction. Because of the massive amounts of cheap AR15s and products on the market now, in 10 or 15 years , younger Gen Z will think of the AR15 the same way the guys who used the M16 early in Vietnam thought about them. They will joke about what a piece of crap it is. It will be like listening to guys who were in the Army in the 80s complain about how bad the 1911 is because every one they handled was worn out. They won’t know any better because most of their experience around them will be around utter garbage like the one posted above. I could see that happening. Maybe on a longer timeline but I can see it.


  1. On the typical MOE stock, the buffer tube hole is a through hole with a removable rubber butt pad. Nothing back there to stop anything coming through, just enough plastic so the rubber doesn’t fall off. I’m kinda surprised it didn’t rip the screw out.

    All the Colt M4 stocks I’ve seen are open on the back also. They wouldn’t anything going out the back either.

  2. Every carbine stock is manufactured that way. What failed was the tabs that lock the buttpad to the stock.

    Magpul is gonna be real surprised to find out the armed forces aren’t buying their stocks.

  3. Look at the color and cut lines to the upper and lower. That’s a billet rifle, not a cheaper forging. Also, why are we complaining about the stock when it was the buffer tube that failed? Why doesnt the tube get any heat for the failure? Also, I’ve only ever seen LE/MIL stocks with solid plates, and you would likely still have issues due to reduced spring pressure, assuming the stock wasnt fully extended at the time and would have the buffer itself rattling about. When you make 16million plus rifles, sometimes things will break in new and exciting ways.

  4. That is a buffer tube failure, not the MOE stock. Buffer tubes have a vent hole at the rear to exhaust the air as the buffer (piston) moves under recoil.


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