Old 02-13-2011, 06:51 PM   #1
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Back ups on free flaot

For any one who is using them, or have heard from those who have, what kind of performance is typically expected with back up sights combined with a rail free float handguard? I understand not all free float handguards are created equil. The better the mount is and depending on how solid it it will determine alot. I am hoping to be able to achieve decent accuracy for the purpose, Back Up. I don't anticipate shooting any matches, mabe a coyote over 100-150 yards with BUS.

Dang, I didn't spell "float" right. Sorry, can't change that.
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Old 02-13-2011, 07:58 PM   #2
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What do you mean by performance? As long as the free float is installed straight and aligned with the receiver, you won't have any problems. You should easily be able to zero at 100 yards. Backup sights generally have thicker posts, but it will still easily hit man sized targets.
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Old 02-13-2011, 08:14 PM   #3
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Thanks DF mainly holding zero.

Looking at these.
Samson Mfg: AR-15, AK-47, Sig 556 Rails and Accessories: Samson FFS & FRS Sight Package (Best Value)
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Old 02-14-2011, 04:08 PM   #4
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I suggest looking at Troy sights. I have one as my rear and it is amazing. They're built to exceed mil-spec and are pretty slim as far as flip up sights go. They lay less than 0.5" above the top of your rail. They're also VERY strong. If you shop around, you can find them for $100 each. Mine was $98 after shipping.
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Old 02-14-2011, 07:48 PM   #5
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Thanks, I know they are top notch. Something drew me to the Samson. I'm aslo a bit on the fence as far as HK or M4 front site. I may sit on it for a while, might end up flippi'n a coin, LOL
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Old 02-14-2011, 08:50 PM   #6
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If you're not opposed to fixed backup sights, Centurion Arms makes a full front and rear HK drum style sight.

C4 "Diopter" Iron Sights, Front and Rear
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Old 02-15-2011, 10:38 AM   #7
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Hmmm. I took the original question to be whether or not putting a sight on the free float tube would lead to accuracy problems attributable to movement of the site relative to the barrel.

Both my tubes are threaded onto about an inch and a half of very fine male thread and quite solid. I haven't seen a free float tube that was not solidly mounted, probably because they serve as attachment base for a lot of things and would move appreciably if they weren't.

I don't think I would mount a high power scope for long range precision work on them, but given my eyesight, any iron sight mounted on there should work as well as any other mounting point. Understand that I feel like I'm having a good day if I can even see a 4" target at 50 yards with irons.
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Old 02-15-2011, 01:39 PM   #8
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Quote:       Originally Posted by DaTeacha View Post
Hmmm. I took the original question to be whether or not putting a sight on the free float tube would lead to accuracy problems attributable to movement of the site relative to the barrel.
Both my tubes are threaded onto about an inch and a half of very fine male thread and quite solid. I haven't seen a free float tube that was not solidly mounted, probably because they serve as attachment base for a lot of things and would move appreciably if they weren't.
I don't think I would mount a high power scope for long range precision work on them, but given my eyesight, any iron sight mounted on there should work as well as any other mounting point. Understand that I feel like I'm having a good day if I can even see a 4" target at 50 yards with irons.

Why would someone be mounting an optic on the free float hand guard (or any hand guard for that matter instead of on the receiver?
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Old 02-15-2011, 02:13 PM   #9
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Quote:       Originally Posted by TACAV View Post
Why would someone be mounting an optic on the free float hand guard (or any hand guard for that matter instead of on the receiver?
If it has unlimited eye relief, it would be user preference. But I agree, you do run the risk of the handguard of not being absolutely straight and will affect your holdovers at any distance other than zero. Best to stay on the receiver. However, sometimes with certain optics and mount combinations, the mount will span from receiver to handguard.

The only other reason I could even guess at is to cowitness with a carry handle/A2 upper. But normally a Z-mount is used.
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Old 02-15-2011, 06:16 PM   #10
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I don't think they would, either, but with ARs being so easily customized, I could see someone maybe putting a scout scope or something of the sort out there, especially near the back. Again, I don't see why, but who knows what someone might think is a better idea?

What about the magnifiers for some of the high end holo style sights? Do they mount on the tube or is there room on the receiver? That is not my cup of tea, so to speak, so I know nothing except some of those sights cost more than my two guns combined.
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Old 02-15-2011, 06:32 PM   #11
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Quote:       Originally Posted by DaTeacha View Post
I don't think they would, either, but with ARs being so easily customized, I could see someone maybe putting a scout scope or something of the sort out there, especially near the back. Again, I don't see why, but who knows what someone might think is a better idea?

What about the magnifiers for some of the high end holo style sights? Do they mount on the tube or is there room on the receiver? That is not my cup of tea, so to speak, so I know nothing except some of those sights cost more than my two guns combined.
Generally you should be able to mount the red-dot or holosight and the magnifier on the receiver rail. With the Aimpoints, you may have to use a cantilever mount to get it forward enough. With EOTechs, the longer versions may have the part of the battery compartment hanging over the forearm, but will still attach on the receiver.
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Old 02-15-2011, 08:44 PM   #12
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Quote:       Originally Posted by Darkfront View Post
If you're not opposed to fixed backup sights, Centurion Arms makes a full front and rear HK drum style sight.

C4 "Diopter" Iron Sights, Front and Rear

Great conversation. Thanks for the link DF. I'll be mounting this set up (link), or something similar. I'm thinking folding back ups would be more practicle?
GG&G
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Old 02-15-2011, 09:28 PM   #13
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Quote:       Originally Posted by jerry View Post
Great conversation. Thanks for the link DF. I'll be mounting this set up (link), or something similar. I'm thinking folding back ups would be more practicle?
GG&G
If you're going to use a variable scope, then I'd agree flip up sights will work better. If you were going to use a non-magnified optic, it would be a wash as your brain and eye could easily tune out the irons with minimal practice if they were set in the lower 1/3 position.
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Old 02-15-2011, 09:47 PM   #14
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Rodger that, thanks.
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