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 acog for sbr?
Ky-Moonshiner  [Team Member]
4/10/2012 11:38:35 PM
Whats the best acog recticle for 10.5" BDC? Shotting a noveske with an m41k i get greta repeatable accuracy at 350m with my eotech i could probbaly push t a little more. I've wanted one for a while and they offer many options. I want a set of crosshairs or a chevron, which modle should I use?
poopile  [Team Member]
4/11/2012 11:01:13 AM
Are you looking for magnification? I run a TA11 on my 11.5" but I think the TA33 is ideal for an SBR. I'd probably go with the chevron but I think Trijicon has all the reticles figured out and they all have their own pros and cons. My opinion is that with a chevron or doughnut or something similar, when a fast, close-up shot is required, the reticle can still be used as a sort of red dot where you just cover the target and pull the trigger. I've never had a cross hair but I think you'd loose some of that ability with it. The only thing to be aware of is that the BDC will be off with a 10.5" barrel. I think the shortest barrel that Trijicon calibrates for is the 14.5".
Burnsy87  [Team Member]
4/11/2012 5:12:58 PM
TA33, horse shoe reticule. Extremely fast reticule. 3x magnification, learn to use BAC and you'll be fine.
Poppy83  [Member]
4/11/2012 9:28:21 PM
I've noticed a plethora of TA33 for sale on the EE for pretty good prices. I'm currently running a TA11 with the horseshoe reticle. It was on a 10.5, but now it is on a 12.5. BAC is an awesome thing and the eye relief is great on the TA11.
Ky-Moonshiner  [Team Member]
4/12/2012 12:00:27 AM
ive got an eye on a ta33 and ta01 4x

why go 3x over 4x? i already hve an eotech i'll be taking off. i prefer a fine recticle or chev, why does the 33 seem larger than the 4x? Also fiberoptic versus non fiber optic?
DJinGA  [Life Member]
4/12/2012 12:43:40 AM
Is 8" too short for magnification? I'll be running suppressed 300BLK so no long range, but my eyes are going bad again (9 yeas post LASIK).
poopile  [Team Member]
4/12/2012 10:09:24 AM
Originally Posted By DJinGA:
Is 8" too short for magnification? I'll be running suppressed 300BLK so no long range, but my eyes are going bad again (9 yeas post LASIK).


I don't think anything is too short for magnification. There's no magic book that says "don't put a scope on a short barreled rifle". It's your rifle to set up the way that works best for you. If you have shitty eyes (I do too and I'm only 37), than mount an ACOG and enjoy your setup. I have no idea what the ballistics are for a subsonic 300 BLK. Doesn't really matter. A little magnification is great for target ID (human or otherwise) and an ACOG is still pretty damn quick for up close stuff.
lmlandlord  [Member]
4/12/2012 6:40:32 PM
I bought a New in the box TA31RCO-M4CP. It has 4x32 power Scope with BAC USMC Rifle Combat Optic (RCO) and specifically used for the for M16M4 carbine.

My Colt 6933 should be in my hands by mid August.

Dane
308Sako  [Member]
4/13/2012 8:39:46 AM
Since the purpose of this SBR will be the desert pursuit of coyotes; the TAO1NSN is my choice of perfection.

DJinGA  [Life Member]
4/13/2012 11:16:30 AM
Originally Posted By lmlandlord:
I bought a New in the box TA31RCO-M4CP. It has 4x32 power Scope with BAC USMC Rifle Combat Optic (RCO) and specifically used for the for M16M4 carbine.

My Colt 6933 should be in my hands by mid August.

Dane


Help me out, how is the RCO different from the other TA31s?
poopile  [Team Member]
4/13/2012 11:43:58 AM
Originally Posted By DJinGA:
Originally Posted By lmlandlord:
I bought a New in the box TA31RCO-M4CP. It has 4x32 power Scope with BAC USMC Rifle Combat Optic (RCO) and specifically used for the for M16M4 carbine.

My Colt 6933 should be in my hands by mid August.

Dane


Help me out, how is the RCO different from the other TA31s?


Reticle, tethered caps, and comes with flip covers and a killflash.
dana  [Team Member]
4/13/2012 7:05:32 PM
Originally Posted By 308Sako:
Since the purpose of this SBR will be the desert pursuit of coyotes; the TAO1NSN is my choice of perfection.

http://i181.photobucket.com/albums/x160/308sako/SBR115build.jpg


can you give me some specs on this build? What is the rail and what can is this?


308Sako  [Member]
4/14/2012 10:32:39 PM

Originally Posted By dana:
Originally Posted By 308Sako:
Since the purpose of this SBR will be the desert pursuit of coyotes; the TAO1NSN is my choice of perfection.

http://i181.photobucket.com/albums/x160/308sako/SBR115build.jpg


can you give me some specs on this build? What is the rail and what can is this?



First be appraised that this upper is in the possession of a SBR stamped active LEO.

My SBR stamp is pending... that should explain the above.

The can is mine, an AAC SPR-M4.

Upper reciever is a Colt A3, bolt and carrier from that rifle as well.
Barrel is Bravo Co. 11.5 LW CL 1 in 7 twist.
AAC 51T mount/flash hider
Gas block is Daniel Defense low profile .625 diameter.
Handguard is the Apex Machine, I cannot say enough good things about the solid feel of this part.
Optic as shown TA01NSN ACOG.

We have test fired this upper on the LEO's lower and it is sub MOA with several loads, but about 50 ft/secs slower on average than his 11.5 Bravo Co barreled upper, My luck! The AAC SPR-M4 being a reflex mounting can keeps the overall length to about that of a 17" carbine... sweet by my standards.


bobweaver  [Team Member]
4/14/2012 10:44:25 PM
I put my TA33G-H on my DD 10.3" and the BDC marks didn't work out for me. Within 100 it was ok but out at 200 and beyond rounds were impacting very low, as in I was hitting dirt 50 yards in front of the steel target. I tried several different rounds including 55g, 62g and 75g. Put the TA33 back on my 16" and POI was spot on again, matching up with the BDC out to 600 using 62g.
Ky-Moonshiner  [Team Member]
4/14/2012 11:13:40 PM
Originally Posted By bobweaver:
I put my TA33G-H on my DD 10.3" and the BDC marks didn't work out for me. Within 100 it was ok but out at 200 and beyond rounds were impacting very low, as in I was hitting dirt 50 yards in front of the steel target. I tried several different rounds including 55g, 62g and 75g. Put the TA33 back on my 16" and POI was spot on again, matching up with the BDC out to 600 using 62g.


this is what i thought i would hear... whats mean? im going to have to build another rifle in addition to this sbr
Cole2534  [Team Member]
4/15/2012 2:42:03 PM
Originally Posted By bobweaver:
I put my TA33G-H on my DD 10.3" and the BDC marks didn't work out for me. Within 100 it was ok but out at 200 and beyond rounds were impacting very low, as in I was hitting dirt 50 yards in front of the steel target. I tried several different rounds including 55g, 62g and 75g. Put the TA33 back on my 16" and POI was spot on again, matching up with the BDC out to 600 using 62g.

Umm, no shit? Did you really expect the reticle to change when it sensed it was on a shorter bbl?

Edit, damn phone

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Ky-Moonshiner  [Team Member]
4/15/2012 3:20:50 PM
Umm no that "article" won't read the OP. I asked if there was a recticle that would work on a 10.5"
Cole2534  [Team Member]
4/15/2012 3:51:34 PM
Originally Posted By Ky-Moonshiner:
Umm no that "article" won't read the OP. I asked if there was a recticle that would work on a 10.5"


I see what you're looking for, but don't understand how this guy was miffed the bdc didn't work when he chopped 5-1/2" from his bbl.

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KCabbage  [Member]
4/15/2012 6:00:49 PM
I sold my TA33G-H in favor for a TA44G (1.5x16). It was tuff selling it but I don't regret it. The FOV with the TA33G-H was the killer for me, just too small.
bobweaver  [Team Member]
4/15/2012 6:53:33 PM
Originally Posted By Cole2534:
Originally Posted By Ky-Moonshiner:
Umm no that "article" won't read the OP. I asked if there was a recticle that would work on a 10.5"


I see what you're looking for, but don't understand how this guy was miffed the bdc didn't work when he chopped 5-1/2" from his bbl.

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I wasn't suprised by it at all, I just wanted to see how much it would be off. I called Trijicon before buying that particular ACOG and was told the BDC was calibrated for 62g 5.56 ammo out of a 16" barrel. I knew it would be off but just wanted to see what the difference would be in bullet drop out of the shorter barrel. I ended up buying a RX30 for the 10.3 and it is pretty accurate at point blank range; anything under 200y or so. OP asked about that scope and I happen to have tried it so I passed along the info so he would be able to make a desicion based upon actual legit info.
Poppy83  [Member]
4/15/2012 8:26:25 PM

Originally Posted By bobweaver:
Originally Posted By Cole2534:
Originally Posted By Ky-Moonshiner:
Umm no that "article" won't read the OP. I asked if there was a recticle that would work on a 10.5"


I see what you're looking for, but don't understand how this guy was miffed the bdc didn't work when he chopped 5-1/2" from his bbl.

Posted Via AR15.Com Mobile


I wasn't suprised by it at all, I just wanted to see how much it would be off. I called Trijicon before buying that particular ACOG and was told the BDC was calibrated for 62g 5.56 ammo out of a 16" barrel. I knew it would be off but just wanted to see what the difference would be in bullet drop out of the shorter barrel. I ended up buying a RX30 for the 10.3 and it is pretty accurate at point blank range; anything under 200y or so. OP asked about that scope and I happen to have tried it so I passed along the info so he would be able to make a desicion based upon actual legit info.

I just moved my Ta11H to my 12.5" SBR and am hoping the BDC isn't as far off as it would have been on my 10.5". Realistically, though, I don't see shooting past 300 yards and it should not be too far off at that short of a distance. The longest range I can get to regularly is only 150 yards.
Ky-Moonshiner  [Team Member]
4/15/2012 9:55:04 PM
Think i'm gonna zero at 200 yards, shoot low at 100 and high at 300, I wanna be able to deer hunt from one side of the valley/draw to the other with some magnification, guess i could ahve opted for an aimpoint 3x. May still do that and build up a 16" rifle like I mentioned earlier.
DJinGA  [Life Member]
4/15/2012 11:50:29 PM
So...what IS the right approach for handling bullet drop from an SBR if all combat optics are set for 16"?
Cole2534  [Team Member]
4/16/2012 9:34:43 AM
Originally Posted By DJinGA:
So...what IS the right approach for handling bullet drop from an SBR if all combat optics are set for 16"?


Math it out? The bullet drop data should be available for each scenario so compare them and make some references. You can still use the reticle for ranging, you'll just have to adjust your holdover.

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308Sako  [Member]
4/16/2012 11:47:55 AM
The only true effective way to determine where your ammunition will land is to fire your weapon at various ranges to determine actual zero's.

Since the ACOG sight is a fixed proposition you can learn your drops, record them and be an effective shooter.

Yes you can get close by using various bullet weights (different BC's) and altering the velocity of those rounds by handloading to attempt to follow the preset "curve." Regardless, the ACOG is an amazing sight for this application.

The following is submitted to provide some data towards the above statements.

Actual chronograph readings from 11.5 inch Bravo Co LW CL barrels:

50 grain Remington JHP 2825 ft/secs.
55 grain Sierra Game King (Federal factory) 2776 ft/secs.
55 grain FMJ Privi Partisan 2809 ft/secs.
55 grain Hornady FMJ handload 26.0 grains TAC 2807 ft/secs.
55 grain LC '09 2829 ft/secs.

60 grain V-Max by Black Hills Blue Box 2690 ft/secs.

69 grain Sierra MK max load IMR 8208 XBR 2540 ft/secs.

75 grain Hornady BTHP max load IMR 8208 XBR 2535 ft/secs.

77 grain Sierra MK max load of TAC 2455 ft/secs.

Added 4/18/2012, Shot this AM, Wolf Military 55 FMJ steel case: 11.5 LW CL bravo barrel A= 2741 ft/secs, barrel B = 2712 ft/secs.






t_kothmann  [Member]
4/18/2012 11:31:32 AM
Love my mini. 1.5x. Green circle with dot

bradpierson26  [Team Member]
4/18/2012 11:33:32 AM
So is there not a big enough market for Trijicon to make a specific ACOG for a MK18 or 11.5 upper?
poopile  [Team Member]
4/20/2012 9:49:45 AM
Originally Posted By bradpierson26:
So is there not a big enough market for Trijicon to make a specific ACOG for a MK18 or 11.5 upper?


Most people are of the mind set that SBR's are worthless past 100 yards. So then the next obvious question is why have a BDC reticle especially for a short barrel. I am a proud owner of an SBR and an ACOG, and I still don't think I'd spend my hard-earned money on an SBR specific ACOG.
lilMAC25  [Member]
4/20/2012 11:37:49 AM
Originally Posted By t_kothmann:
Love my mini. 1.5x. Green circle with dot

http://i1232.photobucket.com/albums/ff373/t_kothmann/da8de56f.jpg


That's the ACOG I want for my SBR. I plan on moving my 1-4 PST to my eventual 10" 300 Blackout upper.
Burnsy87  [Team Member]
4/20/2012 11:38:38 AM
Originally Posted By poopile:
Originally Posted By bradpierson26:
So is there not a big enough market for Trijicon to make a specific ACOG for a MK18 or 11.5 upper?


Most people are of the mind set that SBR's are worthless past 100 yards. So then the next obvious question is why have a BDC reticle especially for a short barrel. I am a proud owner of an SBR and an ACOG, and I still don't think I'd spend my hard-earned money on an SBR specific ACOG.


While this may not be cost-effective, Trijicon may be wise to start researching BDC for 300 BLK and 6.8SPC out of SBR's, just to give that crowd options. They wouldn't sell many, but it'd be a hell of a nice option to have. Which means it won't happen.
Freakinout  [Team Member]
4/20/2012 6:56:09 PM
TA33 on my 11.5" setup. Would do the same again.


ICON_636  [Member]
4/20/2012 10:05:19 PM
I'm considering doing something similar to this with a TA33 and an RMR on a Burckett offset mount. Just depends on how much jack your willing to throw down I guess.

http://www.youtube.com/watch?v=ZVy-qobrts0



Pain  [Team Member]
4/21/2012 3:54:30 AM
A small light Acog would be fine.


The way I look at a SBR is, It's a short range gun so I want my SBR to be battery-less and light weight.
Who wants a 10LB SBR??
Cole2534  [Team Member]
4/22/2012 8:15:33 PM
Here's what I've been playing with-



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