REMINGTON 870 +2 MAG EXTENSION

Looking to swap/trade my like-new Scattergun Technologies (Wilson Combat) +2 Magazine Extension for either a Remington OEM factory +2 or Nordic Components +2 extension. 

Reason for swap is I have a 18.5” barrel and want the mag extension to sit flush with the barrel.  This mag extension will fit flush on Remington 870 18” barrels.