I did it myself and was very easy. Just need to used a dremel to take a thread or so off the night sight so the threads dont go into the barrel. The sight is mossberg shotgun universal and the 590a1 and some others have a thicker barrel. Took less than 30 minutes to install
G19, G22 RTF2, G22, G34
Sig M11a1, Sig P938
Remington R1 enhanced SS
Last edited by JDennis; 11-19-2012 at 10:51..