View Full Version : Zero/Patterning question

Bernie Lomax
April 16, 2011, 07:46 AM
Hi all,

I have a Mossberg 590A1 with GRS that I'm thinking of getting a mag extension for. When I put the extension on, will my shotty have the same zero and patterns as it does with the stock magazine cap, or do I need to re-zero and re-pattern it?

TIA for any info anyone can give me.

April 16, 2011, 09:46 AM
Yes it would be the same with the possible exception of harmonics affecting things a tiny bit... But we are talking about a phenomenon reserved for longer range rifle shooting so I doubt any normal fella could tell.


Bernie Lomax
April 17, 2011, 10:55 AM

April 19, 2011, 02:37 PM
It shouldnt affect the point of impact enough to notice.