Castle nut staking, why the big deal?

[Robb Jensen]

I fully understand why someone would want the nut staked, it obviously makes sense. The question is, why is it so important when so many people take it off to replace the stock, or put in a sling attachment point? Do these same people restake it when they finish? Can you even restake it after putting in a sling attachment point? It just does not make sense to me to use that particular feature as an indicator of the quality of manufacture when it seems to be a commonly removed part.

A related question, does the nut and/or tube need to be removed to replace the stock with a UBR or the M93B?

Same reason that your tires should be inflated to the car manufacturers spec. Will 20psi get you down the road.....maybe. But 30ps is required on my truck. I'm just guessing that 20psi wears the tires faster and/or makes the truck harder to control on the road.

The UBR and M93 series stocks don't have castle nuts for end plates to stake into. Their extensions are like A1/A2 rifle extensions. They're installed to the torque spec and held in by the stock screw.

I'm not an AR engineer but I did stay at a few times.

End plates can be resused and restaked, ideally you should use a new end plate especially if you don't have enough metal to stake into the castle nut notches in at least two spots.