Used M4 Barrel Nut (Manufacturer and thread pitch unknown)

Used M4 Series Barrel Nut (Manufacturer and Thread Pitch Unknown)
This is a barrel nut used to secure M4 series handguards.
Selling as part of a parts cleanup.
■Product Condition
Shows signs of use: Minor scratches and scuffs from installation/removal, paint peeling on the threads, etc.
Condition: No critical damage such as warping or stripped threads is apparent, but please check the images for details.
■Specifications (Please confirm)
Manufacturer: Unknown
Thread Pitch: Unknown (Cannot determine if it is metric or imperial pitch)
Dimensions (Outer)
Total length approx. 35mm, Outer diameter approx. 40mm
Threaded portion: Thread diameter approx. 35.5mm, Thread depth approx. 19mm
Number of holes: 6

Shape: This is the type with multiple fixing holes on the outer circumference.
Compatibility: Based on the shape, it appears similar to Geissele SMR MK16/MK18 or KSC Striketec TEG (No. 42) barrel lock ring, but compatibility with specific handguards cannot be guaranteed.
■Notes
As the manufacturer and thread standard are unknown, please purchase only if you are prepared to modify it or can determine compatibility yourself.
Returns due to incompatibility will not be accepted.
Thank you for your understanding that this is a used item sold as-is.

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