M6 Metric Thread Adapter

Converts bolt handles with an M6 thread to accept 5/16 x 24 UNF bolt knobs

From Lumley Arms, this thread adapter has an internal metric M6 thread and an external 5/16 x 24 UNF thread to just about fit every other aftermarket bolt knob including our carbon fiber models. Common with European and rimfire rifles, aftermarket options for knobs threaded in M6 are limited.


CNC machined from brass, this adapter won't corrode and is softer than the bolt handle steel or knob you will fit for ease of future removal. If a thread locking compound is used, we don't recommend attaching the adapter to the handle, rather the knob.



Check first that there is sufficient internal threaded length of the bolt handle you intend to fit (15mm / 0.6"). If necessary, the adapter can be shortened and threads cleaned up to fit other bolt knobs with less internal threaded length.