Product Description
Factory Colt receiver extension castle nut for M4/AR15 type rifles.
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Product Reviews
31 Reviews Hide Reviews Show Reviews
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It works
In my experience Colt castle nuts are consistent and work well.
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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.
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Castle nut
Colt is legit. Great parts to have on standby.
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Original Colt parts are hard to find for AR's.
Parts were what I was looking for. They were perfect.
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Colt Castle Nut
Great experience buying this. I'm going to buy another.
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Colt
Great fit and finish.
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A+
A+
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Great replacement
If your building a new build or replacing an old existing part, look no further, this is what you need.
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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!
