Question For The AR Optic Guys

[krunchnik]

I have a Bushnell red dot sight mounted on my DPMS,just a question-will this mount present any problems.What I am wondering about is the rail being on part of the receiver and also partly mounted on the guard, dont know if this will affect accuracy or not,what say the experts(considering I am not)

Edited July 23, 2012 by krunchnik

[Caster]

Can't scoot it back any?

I doubt it'd be a problem. One way to know, go zero it in. Bring it home and throw it down on the bed as hard as you dare to. Recheck zero.

One of my AR's has an Eotech. I held it over my head and threw it down flat against my bed [tempurpedic mattress is none to soft] as hard as I could. Zero was dead on.

Edited July 23, 2012 by Caster

[broox]

I am also certainly no expert, but does the handguard move? Both of my hanguard move a little, which makes me think that setup might not hold zero.

[TMF]

Yes, it could absolutely have an effect on the accuracy, especially being on drop-in handguards that don't appear to have a "lock down" feature such as the KA handguards. However, what are you planning on using it for? It's just a red dot, so unless it's anything past 25-50m I don't think it'll matter unless you need it to be dead on. If it was an optic with magnification for longer range I would tell you to move it back, but you should be fine if you're not shooting at stuff that far away.. it won't affect it enough to matter, especially with the rear locked into the receiver.

EDIT:

Is that a .22 upper by the way? I was just looking at the bolt and figured it was. If so then it really, really doesn't matter. Keep your optic where it's at and shoot away... it's a .22 after all.

Edited July 23, 2012 by TMF 18B

[krunchnik]

Thanks for all the quick replies,its a 22lr conversion by CMMG,but it is a 556 NATO upper.I do only plan on shooting distances of 100 yards and under-even with the 556.Mostly around the 50 mark would be my guess.And yes the biggest half of the mount is locked onto the receiver,I wanted my BUIS to work with the dot sight without removing and reinstalling when needed.I dont know if this is the answer but I guess I will find out or not.

[TNcitizen22]

One of my AR's has an Eotech. I held it over my head and threw it down flat against my bed [tempurpedic mattress is none to soft] as hard as I could. Zero was dead on.

Ditto on my Eotech. I simply cant get it to lose zero.

[TMF]

Thanks for all the quick replies,its a 22lr conversion by CMMG,but it is a 556 NATO upper.I do only plan on shooting distances of 100 yards and under-even with the 556.Mostly around the 50 mark would be my guess.And yes the biggest half of the mount is locked onto the receiver,I wanted my BUIS to work with the dot sight without removing and reinstalling when needed.I dont know if this is the answer but I guess I will find out or not.

Yeah man, give it a shot. With the back half of it on the receiver it shouldn't mess it up even at 100m. I could see it screwing up your zero if there were some force applied to the handguards (such as gripping it, or the handguards getting knocked around) but even then it might only be a few MOA off. At 100m with an unmagnified red dot that is nothing. I've never used a red dot for anything past 100m... that's what I use my irons for.

[Guest nowheretobefound]

I'm not familiar with a Bushnell red dot and we can't see how far back it goes or if you have something attached to it. But to answer you yes it could definitely mess with your accuracy.

My question is why do you have it bridging over in the first place?

[krunchnik]

I'm not familiar with a Bushnell red dot and we can't see how far back it goes or if you have something attached to it. But to answer you yes it could definitely mess with your accuracy.

My question is why do you have it bridging over in the first place?

trying to get it forward away from the iron sight,I may have to just use the dot and just mount the sights when I need them,if ever.The dot sight has nothing else attached.

[mikegideon]

Yeah man, give it a shot. With the back half of it on the receiver it shouldn't mess it up even at 100m. I could see it screwing up your zero if there were some force applied to the handguards (such as gripping it, or the handguards getting knocked around) but even then it might only be a few MOA off. At 100m with an unmagnified red dot that is nothing. I've never used a red dot for anything past 100m... that's what I use my irons for.

It's not a free float handguard, so there's force applied every time you shoot it, especially with 5.56. I have one of those optics, and understand why he pushed it forward. It's big. It has a great sight picture. If it were me, I would use the backup sight on the optic, and move it back where it lives on the receiver.

[krunchnik]

It's not a free float handguard, so there's force applied every time you shoot it, especially with 5.56. I have one of those optics, and understand why he pushed it forward. It's big. It has a great sight picture. If it were me, I would use the backup sight on the optic, and move it back where it lives on the receiver.

Yup,thats what I am gonna do,and try her that way.I didn't really like that mounting spot,I like to see the mount right above the action,already changed it.

[mikegideon]

It's just big. No room for a backup sight. So, when I had it mounted, I just planned to use the on board iron sites. I think they're actually close to workable.

[krunchnik]

I think this will work a lot better

[gjohnsoniv]

I was going to suggest putting a riser on, but it looks like you beat me to it.

[mikegideon]

Looks better than pulling the rear sight.

[krunchnik]

Yeh,this way I can leave the irons on it and if needed take the red dot off.

[mikegideon]

Yeh,this way I can leave the irons on it and if needed take the red dot off.

Don't you love the sight picture on that thing? I like it better than my Aimpoint, and maybe even my Eotechs.

[krunchnik]

I dont have any of the high end optics to compare,but I do like the view on the Bushnell.I originally sighted the rifle with a Red Head 1X44,but it didn't seem very sturdy,so I purchased the Bushnell,which seems very much so,almost overbuilt.The rifle was shooting a 2 inch group at 100 yards,so I figured that was pretty decent with a dot sight.I will have to see how the Bushnell does.