Colt M4/AR15 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.

Great Colt product at a good price.

Works perfectly as a high quality Colt part.

Great Colt quality. Got it fast .

Worked great , fast shipping.

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.

Colt is good! But once again arms unlimited with their pricing, inventory, and customer service is great!

Simple and dead-nut dependable.

Colt quality...