Factory Colt receiver extension castle nut for M4/AR15 type rifles.
Reviews
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Colt M4 Receiver Extension Castle Nut
I have always appreciated metal fabrication, even for simple parts. I really like the concentric machine marks, slightly radiuses edges, and even phosphate finish on this part-it just screams quality. If I was younger I’d gauge my ears with Colt Receiver Extension Castle Nuts, but I’m not, so I won’t.
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Great Colt product
Great Colt product at a good price.
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Great Colt quality at a good price
Works perfectly as a high quality Colt part.
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Colt extension castle nut
Great Colt quality. Got it fast .
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Barrel nut
Worked great , fast shipping.
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Keep it Colt
ArmsUnlimited is my go-to for Colt parts. Working on an M4 clone I needed the Milspec Colt 4 position receiver extension. Armsunlimited was out of stock so I signed up for a notification.. Within days I get a notification in my email that the item was in stock . I ordered it immediately along with a Colt castle nut (had an endplate) and I had it within a few days. All in all, I have used these guys a number of times and it’s always a fair price (no gouging), fast shipping, and all the rest that goes along with great service.
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Colt parts
Colt is good! But once again arms unlimited with their pricing, inventory, and customer service is great!
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Perfect
Simple and dead-nut dependable.
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Great pricing
Colt quality...