Burris Fastfire III Optic Mounting

[Razor1994]

I'm thinking about getting a Burris Fastfire III red dot for my Mossberg 835. I've never put any type of optic on my gun and was wondering what the best options for mounting the Fastfire might be. I still have the original front and rear sigts on the Mossberg and would like to keep them and use as a backup. Any Mossberg users with a Fastfire out there?

 

[Grizzly Johnson]

If you mount that optic, won't be any using the original sights as back-up.... I believe the Mossberg uses the Marlin 336 mounting plate... it sits lower to the receiver.

You can get on OldGobbler.com and do some reading, probably find more answers.

 

[Razor1994]

Thanks for the advice....not familiar with the Marlin mount. Based on what you said, I assume I will have to take off my original sight in order to mount the Burris. Thanks again for the help Grizzly.

 

[REN]

you shouldnt have to take off the original sight unless it is on the receiver somehow. the marlin mount is the way to go for sure.

 

[fredfred]

The plate is Burris part #410333

 

[chrmayo]

Here's what the 336 mount looks like on.

And an under shot of base.

 

[Razor1994]

Thanks for the replies and info....looks like Marlin 336 it will be....gonna have to get the gun out and see if any drilling will be necessary...

 

[chrmayo]

If it's a factory drilled mossberg it should mount right up. I'm switching mine over to my 935 grand slam I just traded for.

 

[Razor1994]

Thanks....I was hoping I wouldn't have to do any drilling. From looking at my gun, I see no reason why I can't look through the fastfire and use my existing sites as backup if I had to. The existing sites are well in front of where the Fastfire would sit.

 

[whiskey]

I have the FFIII on a Marlin 336 base on my Mossberg and I can't use the factory sights that came on the gun. Even looking through the sight, you can't align the irons. Last year I carried a torx wrench in my vest incase I needed to pull the sight off in the field.

 

[LanceS4803]

Time to drag this back up, after a year, but I am getting ready to buy a FF III and have a question.

Burris sells the FF III with and without a picatinny base.
So when using this on a Mossberg 835, I DO NOT need the picatinny base is I am going to use the #410333 base?

 

[Carlos]

Any update on this for the 835?

 

[Shag]

Any update on this for the 835?

Dang! Lazarus thread here @Carlos !

Can't speak to the 835's. I've got FF3's on two 11-87 20 gauges. Both drilled and mounted directly to the receiver. One I did myself. I wouldn't say it's difficult…but it is nerve wracking.

 

[Southern Sportsman]

Time to drag this back up, after a year, but I am getting ready to buy a FF III and have a question.

Burris sells the FF III with and without a picatinny base.
So when using this on a Mossberg 835, I DO NOT need the picatinny base is I am going to use the #410333 base?

Correct. The picatinny base is purely for mounting on a picatinny rail. Common with ARs, and an option on shotguns, but definitely not the best option.

I have 3 guns with FFIIIs. The Burris mount designed for the Marlin 336 works wonderfully well. I have two of them and no real complaints. It used to be the best option by far. But if I were buying one today, I would definitely order a Sumtoy mount. Aside from being a few dollars cheaper, and being custom made by an American small business, they are a slightly better mount. Both hold the sight as low as possible, but the Sumtoy is machined for a specific model of gun. They are slightly concave on the bottom edge to match the curve of the receiver. More sturdy and less prone to catch on things while moving through cover.

The top picture is from his website. It shows the curvature that I'm talking about. It's shown with a different sight, but the Burris/Vortex mounts are designed the same way. The second is the 336 mount for comparison.