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Funny you should ask. I ordered the same scope and it will be here Tuesday. One thing to consider is which side the mount nuts are on. The Primary Arms extended mount works for me because I'm left handed and the nuts are on the opposite from the charging handle. You run the risk of hitting the mount nuts when you rack the bolt if they are on the same side as the charging handle.
 

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I got the vortex sure fire 2 and their x3 magnifier because I found a packaged deal for cheap. Score one for being broke
 

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I got the vortex sure fire 2 and their x3 magnifier because I found a packaged deal for cheap. Score one for being broke
Please elaborate on the package deal.
 

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For initial test firing of the RDB I moved my KSG's Burris FF3 onto the RDB, which worked fine.

For a long term solution, at my LGS I evaluated the Aimpoint T-2 and the Trijicon MRO. I decided I liked the MRO's lower price and larger 25mm objective lense (less looking down the tube effect). I found on Larue's website they sell a MRO + QD mount package for
price thats better than any other site.
 

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I just ordered the Primary Arms 1-6X Scope with Patented ACSS 5.56 / 5.45 / .308 Reticle "Advanced Combined Sighting System" PAPS1-6x. It's had some good reviews and the ACSS looks intriguing. It's almost identical to the Vortex Strike Eagle.
That is a good value optic but I'm not sure I see the wisdom in fitting a variable power scope (i.e. any magnified scope) to a rifle with a non-free floating barrel? I'm no expert, but it would seem that there will be too much variation in the barrel dynamics on a gun like an RDB in a normal use context, as you use a sling, add/remove bipod, use a VFG and/or rest the handguard against barriers, and heat up the gun during rapid fire.
 

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I'm not sure I see the wisdom in fitting a variable power scope (i.e. any magnified scope) to a rifle with a non-free floating barrel?
Rob, you are right, a non-free floating barrel is less accurate than a free floating barrel all things considered, but that doesn't mean they are inaccurate. Plenty of match shooters have achieved amazing results with 1903 Springfields, M1 Garands, and M16A1 style ARs, all without free floated barrels. I even have a CMP M1D Garand sniper that is extremely accurate and is a non-free floated barrels.

I don't think anyone expects the RDB to be a sub-MOA gun, but it's not like it's going to suddenly open up to 10 MOA or more just from any of the issues you mentioned. Not unless something is mechanically wrong. But even if it's a 3 MOA gun, it should still get you to 300 yards where that zoom is going to come in handy.
 

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I have a Leupold VX-R 1.25-4x in a Warne X-Skel 30mm mount. It's a fantastic combination. At the 1.25x setting, I can keep both eyes open, and the fire-dot is just as fast as any red-dot for me.
 

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I cheaped out at least for now. Just threw a little NC Star red dot on it. It seems to work though, granted I only had 40rds downrange before the RDB decided it didn't want to play nice.

I kept the original sling on it to carry across the chest and it works amazingly well. Added an O light in a mount for a light.
 

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A few pics illustrating the Burris FF3 full cowitness vs Trijicon MRO with Larue 1/3 cowitness.
 

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My first impressions with the MRO are positive. Although in these pics the electronics are visible in the 9 to 12 area of the ocular lense, in practice, much like any other quality red dot sight system on a long gun, the experience is immersive and the optical housing fades away during use. Later, in my LGS, I had an opprtunity to handle a Sig Romeo4c with Eotech style circle and dot and Romeo5 mini red dot. Both are much more affordable than a MRO and even had motion activation features. (Although with a 5yr battery life on an MRO, motion activation becomes irrelevant). I must say, in my mind, the Romeo4 series is a strong contender for a RDB or Romeo5 for the Sub-2000.
 

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I'm struggling with this decision. Part of me wants to get the inexpensive, simple and lightweight Sightron 1X27 red dot. I have a couple (PLR-16, etc.) and they're solid and reliable but lightweight and compact with not much to catch up and snag. Or maybe the Vortex SPARC II red dot. I have one on the CMR-30 and it seems nice. The 1-4 or 1-6 optics from Vortex look OK and I do like the idea of some magnification for the RDB and not needing batteries if they go dead, but I think if I was going that route I'd spend a little more and get the $399 1-4X24 from SWFA. It's a bit heavier but their stuff is built like a tank, and I like the reticle and the mil knobs instead of MOA. The turret knobs are also easier to adjust without dust caps to lose, which I like. I have the SWFA scopes on my longer distance rifles so the mil reticle and mil turrets are familiar to me. Unfortunately, it was apparently $299 not that long ago, and even though it looks very nice for $399, I hate suddenly paying $100 more.

http://swfa.com/SWFA-SS-1-4x24-Tactical-30mm-Riflescope-P78365.aspx

I like Sightron scopes, and they have some low end scopes that look good (although not very tacticool), but I just can't talk myself into a scope with a mil-dot reticle and MOA turrets. That would bug me forever.
 

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I'm pretty happy with my Vector...but I've been looking pretty hard at the Leapers UTG Bug Buster. Heard nothing but good things about this <$90 scope
 

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Some things to consider with optics based on the probable use of the firearm, and you...

1. How close to 45 are you, or do you already wear prescription or reading glasses?
2. Is a HUD red dot that gives you a dot floating on a small pane of glass enough? While small and light, they are not as rugged to getting hit, dropped, etc.
3. What do you do when the battery goes out, do you even want a battery?
4. How far do you plan to shoot? 200 and in, pretty much anything will be okay. 200 and out, glass quality and parallax become an issue. The cheap 1-6s have terrible edge effects and a lot of parallax, so you have to have perfect and repeatable cheek weld...not always possible on a rifle like the RDB.

For anything past about 30 yards, I prefer a red dot that has a focus, or diopter adjustment. 20 years ago, I did not care about that. But being able to adjust a tube red dot for my eyes is a huge benefit to me now. With a straight red dot, I group about 3" for 5 rounds at 100 yards, but with a tube dot adjusted for my eyes, I can cut that down to about 1.5". Same rifle, magnified to 3 or 4x, 1" groups are the norm, which for 55 FMJ is about it. When I get past 100 yards, then magnification becomes more desireable for me unless the targets are big and speed is more important than accuracy.

I like an etched reticle so that if the battery dies, I still have an aiming point. Not a fan of backup irons at all. On a rifle that "must work" I will have an etched/illuminated reticle, a light and a laser, so there is redundancy there. On a plinker, I can take a spare battery to the range. I shot 5 different red dots (or 1x sights) at the range yesterday and I must say that the Holosun is growing on me. If I could take the best features of the Burris AR1X (diopter adjustment and etched reticle) and the Holosun (solar cells and lightweight) that would be a winner.

Since I plan to shoot the RDB past 100 yards, still leaning towards the 1-4 variable power optic and one without large parallax errors.
 

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After some deliberations, I went with the SWFA 1-4X24. I got the kit with the bomb proof mount. The SWFA scopes are bomb proof too. I wanted this to be durable so I wouldn't need to worry much about damage or losing zero if it's banged around a little.

http://swfa.com/SWFA-SS-1-4x24-Tactical-30mm-Riflescope-Kit-P85632.aspx

I also ordered the Butler Creek lens caps at the same time, and managed to find a discount code (HOT10) that saved me 10%.

I bought my RDB online and it's been sitting at the local UPS depot for the last six days. Hopefully my FFL will pick it up soon.

The 40 round Gen 3 PMAGs arrived today. I'll be anxious to see how they work (if they work) with the RDB bullpup design.
 

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I went with a VT sparc AR since Ididnt realize this rifle would fall in my lap and I had one already. I was worried it would be too tall but it is fine. I use aimpoint, trijicon and eotechs at work and they have nothing on this red dot minus battery life. The glass is actually awesome. One of the reasons battery life is only 500-5000 hours is they use AAA batteries which is a trade off I can deal with since AAA batteries are cheap and available everywhere. Put an eotech magnifier behind the VT, the only eotech product worth a hoot.

Will most likely put an acog on her eventually.
 

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I put a Primary Arms 1-6x24 on mine. I really debated back and forth between that and the Vortex, but I like the PA reticle a little better and I've had good luck with them in the past - I ran their 4-14x44 on my 300 Win Magazine during a 2 day long range clinic and it was a champion. Took all that recoil and never had an issue and I was drilling shots out to 1100 yards with it.
So my wife got me the scope as a birthday gift and I picked up an Aero Precision ultralite mount for it. I just got everything setup, I'll be zeroing it this weekend and will report back.
 
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