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M&P15 Castle Nut Removal
- Thread starter gsxunv04
- Start date
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I used this one: CAR stock wrench
Rock River Arms: Mag Catch Tool / Sight Tool / Stock Wrench / Bolt Tool
Rock River Arms: Mag Catch Tool / Sight Tool / Stock Wrench / Bolt Tool
Dragon88
Member
Is your castle nut staked?
Eureka40
Member
Mine was staked and I didn't see that it was. Look carefully cause it is a bear to get off.
Dragon88
Member
Double check on that. Most quality manufacturers stake the castle nut, it is a check mark on "the chart", and for a good reason. Unfortunately if the castle nut is staked you will need to apply a lot of force to turn past it, or dremel the staking off then remove it. Either may destroy the castle nut and/or receiver plate, but they are very inexpensive items to replace.
Standard armorers wrench works here. Do not force, use a dremel to get rid of the staking then remove and do not re-use. Replace the nut with a new one, stake if possible but you will most likely find out at some point that you will need to stake it.
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Maximumbob54
Member
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Just don't use the stamped sheet metal single tooth wrenches. They are a rip off. I wish to heck someone would just make a decent flat sided nut replacment for the poorly designed clastle nut. All the special tool parts should be redone.
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Dragon88
Member
Yes, as mentioned previously you dremel the staking off to remove it.
Another option is a sling adapter that clamps onto the extension tube just behind the castle nut.
akviper
Member
If it's not too late you might also consider the Noveske QD endplate. It allows the use of the Magpul sling or any other two or single point sling and allows the stock to fully collapse.
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I like the Tango Down PR-4 for a QD sling mount behind the receiver. The PR-4 requires no modification. It clamps around the castle nut and buffer tube and provides three QD sockets - one rear facing and one on each side.
Two potential downsides (depending on personal preferences): 1. The sockets do not provide anti-rotation detents, and 2. You cannot collapse stock to the shortest position lock as the PR-4 extends beyond the castle nut a bit.
On the plus side it's very lightweight at 2.4 ounces. Also - once it's installed it's going nowhere! It mounts up rock solid - may as well be a part of the lower receiver as rigid as it is once installed. I did some research before going with the PR-4 and those who have used them on issued service/duty rifles provided very favorable feedback. The PR-4 has no sharp corners/edges and will not catch or snag on anything. It has a seamless / integrated appearance following the lines and curvature of the receiver and castle nut.
I have a PR-4 mounted to my M&P15T (pictured here):
There are plenty of close up pics available through Tango Down dealers and via Google search. Definitely worth consideration!
Two potential downsides (depending on personal preferences): 1. The sockets do not provide anti-rotation detents, and 2. You cannot collapse stock to the shortest position lock as the PR-4 extends beyond the castle nut a bit.
On the plus side it's very lightweight at 2.4 ounces. Also - once it's installed it's going nowhere! It mounts up rock solid - may as well be a part of the lower receiver as rigid as it is once installed. I did some research before going with the PR-4 and those who have used them on issued service/duty rifles provided very favorable feedback. The PR-4 has no sharp corners/edges and will not catch or snag on anything. It has a seamless / integrated appearance following the lines and curvature of the receiver and castle nut.
I have a PR-4 mounted to my M&P15T (pictured here):
There are plenty of close up pics available through Tango Down dealers and via Google search. Definitely worth consideration!
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Dragon88
Member
That Tango Down product is the one I was thinking of. It's not a perfect solution but a lot better than others out there. And you can take it off easily if you don't need it or want it on. The ASAP plate isn't as easily installed or removed, and the little ring that rattles around on it when not in use is ANNOYING!
