Factory Colt receiver extension castle nut for M4/AR15 type rifles.
-
-
-
Sale
-
Sale
Reviews
-
It works
In my experience Colt castle nuts are consistent and work well.
-
Colt Parts
I prefer Colt parts, AU is a reliable source with good inventory, price, and fast shipping. They already had my business, and have worked to keep it.
-
Castle nut
Colt is legit. Great parts to have on standby.
-
Original Colt parts are hard to find for AR's.
Parts were what I was looking for. They were perfect.
-
Colt Castle Nut
Great experience buying this. I'm going to buy another.
-
Colt
Great fit and finish.
-
A+
A+
-
Great replacement
If your building a new build or replacing an old existing part, look no further, this is what you need.
-
Colt castle nut
Quality part; fit and finish is perfect. Colt's has the notches for proper staking of the end plate. As always, great AU service!