Used to tighten the Carbine Buffer Tube to the Lower Receiver, the US Military has used two different versions.
- Lock Ring- original Style, used on XM177's, early Carbines, etc. Long out of production so this is a difficult item to find. Needs the Lock Ring Wrench for tightening (Here)
- Castle Nut- replaced the Lock Ring (above) and is still the current style. Typical for later model Colt Commando's and M4's. Many AR tools have a solution for tightening this castle nut.. there is a Castle Nut Wrench (Here)
Steel
Made in the USA
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It's the Real Deal
Perfect, exactly what I was looking for.
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Receiver extension rare lock ring
Dimensions are era correct. Other than the color being slightly darker, you can’t tell the difference between original.
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perfect for replacement on a colt
used this to replace the consistently walking locking ring on a Colt SMG (9mm, so hard recoil in the AR platform). it is functionally perfect and even has the color correct!
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Retro build
Perfect part for my Vietnam era colt build. This is the only site that has it in stock.
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buffer tube nut
a great part, so hard to find for a Retro build!
