Sig Romeo 5 Keeper

I lost the keeper part of the cross bolt and keeper from my Sig Romeo 5 optic.  Sig only charges 6.99 on their website for the replacement, but wants 15 bucks just to ship it.  Since I am using it on a low recoil device I opted to model it and save the money.  If you are using it on something with a high recoil impulse I suggest paying for the metal part.  https://www.sigsauer.com/romeo5-cross-bolt-and-keeper.html

This model requires a M4x4x6mm female brass knurled nut.