The Down Range Forum

Member Section => Tactical Rifle & Carbine => Topic started by: Bailey0117 on December 28, 2012, 04:22:37 PM

Title: Castle nut
Post by: Bailey0117 on December 28, 2012, 04:22:37 PM

Can anyone tell me if I need to change my castle nut if I change from a commercial extension tube to a mil-spec tube?

Title: Re: Castle nut
Post by: billt on December 28, 2012, 05:25:37 PM

http://www.ar15fornoobs.com/mil-spec-vs-commercial-spec-buffer-tubes

This helps explain it. The thread size is the same because the lowers are all threaded the same to accept them. The size difference is in the tube itself where it accepts the stock. You must have a Commercial stock to fit a commercial buffer tube, and Mil-Spec for a Mil-Spec tube.

Title: Re: Castle nut
Post by: twyacht on December 29, 2012, 05:50:29 AM

What billt posted is correct here's just the diff.

(http://i296.photobucket.com/albums/mm182/twyacht/Buffertube_Specs.jpg)

The castle nut is the same. But have the stock match the tube. That is the difference.

Title: Re: Castle nut
Post by: Bailey0117 on December 29, 2012, 02:42:38 PM

Thanks.   Just wanted to make sure I ordered all the parts I need at the same time

Title: Re: Castle nut
Post by: tombogan03884 on December 29, 2012, 06:41:02 PM

Make sure you get the Carbine specific spring and buffer as well .
The rifle size of either will not work.
Trust me on this.