Need castle nut

[Jacobpoirier]

Thought I needed a castle nut for UBR. Now I know I don't. Thanks every for the help.

 

[*MALICE*]

....?

The UBR tube doesn't use a castle nut......

The UBR comes with it's own tube. It looks like an A2 tube but it's Carbine length.

 

[hbean]

What Malice said
Here is a photo for reference

 

[Jacobpoirier]

Alright. Thanks. I know I could use a wrench on the back, but that still doesn't guarantee it from possibly loosening off (doesn't it).just making sure!

 

[hbean]

you don't even need a stock wrench, the stock and buffer tube is locked in with just a slotted screw, there is indexing knob near the lower receiver end to preventing the whole assembly from coming loose.

 

[JohnnyP636]

Yup have a UBR still brand new in the box here, and it does not use a castle nut. There is a part that goes up at the front where a castle nut would be, it locks into the hole in the back of the lower receiver to stop it from rotating. It also has a QD socket on the other side of the bolt that holds that part into place

This is what replaces a castle nut and end plate when using a UBR, included in the UBR kit

 

[Sqr]

Alright. Thanks. I know I could use a wrench on the back, but that still doesn't guarantee it from possibly loosening off (doesn't it).just making sure!

Carefull as the rifle tube should not be over tightened. Many only have it hand tight.

 

[Jacobpoirier]

Thanks everyone. Big help. I bought it used so didn't have the proper instructions. Suppose I should have YouTube'd it before I asked around. Putting it on tonight.