Colt M4/AR15 Receiver Extension Castle Nut

Excellent part in original Colt packaging—proper hardness to go to 40 inch pounds on the torque wrench. Fast shipment as well. I’ll be back for more!

Best prices on all Colt products. Fast shipping and delivery.

yes, I know I already reviewed this product but the more I handle my new nuts the more impressed I am with their fine fit and finish, they Shure do feel great in the hand. thanks again guys.

needed correct parts for a pair of colt iar builds and I was not disappointed. if I do say so myself this is one great pair of nuts. not often does one receive such a high-quality pair of nuts. they are smooth, well machined, symmetrical, and best of all they are colt nuts. I would buy a pair of these nuts again. thanks A.U. GREAT NUTS!!!!

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.