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Posted: 4/29/2009 4:58:51 PM EDT
[#1]
I'd get the RCO-A4 for the 20 inch. I love mine!
17 inches is exactly between 14 and 20 anyway. If you had a 14.5" and 17" barrels, I'd get the RCO-M4. But 20" and 17", get the A4. 
-Dan ETA: post 1000! |
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Posted: 4/29/2009 5:06:08 PM EDT
[#2]
That's what I'm leaning towards, but would it work with the 17 inch Sig also. If I have to choose one over the other I go with the A4.
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Posted: 4/29/2009 5:13:53 PM EDT
[#3]
I've been happy with the TA31 F for an M4 and an A4. They're a bit cheaper than the RCO
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Posted: 4/29/2009 5:19:32 PM EDT
[#4]
Quoted:
I've been happy with the TA31 F for an M4 and an A4. They're a bit cheaper than the RCO If you don't need lines for adjusting morter and arty fire, I think you would be better off with the 31F. |
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Posted: 4/29/2009 5:31:55 PM EDT
[#5]
I know, but I'm trying to get as close to the real thing as possible.
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Posted: 4/29/2009 5:34:44 PM EDT
[#6]
Quoted:
I know, but I'm trying to get as close to the real thing as possible. The 31F is the real thing. The USMC first bought 01NSNs, then 31F's. Afterwords they decided they wanted a model for the M4, and a model for the A4. There are still plenty of 31F's in service, even though they are being phased out. |
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Posted: 4/29/2009 5:37:10 PM EDT
[#7]
What are the differences? Thanks
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Posted: 4/29/2009 5:57:31 PM EDT
[#8]
The 01 does not have the light bar on top of the ACOG but has a BUIS built into the top of the scope housing. The RCO A4 is for the 20" battle rifle and the RCO M4 is for the 16" M4 battle rifle. I have the RCO M4 and it is a wonderful scope.
My understanding of the ACOG's calibration is if the Sig's twist rate and barrel length is consistent or even comparable with the 16" military M4 then you should be fine. ACOG does not make a military brand of scope and a civilian equivalent. So if you buy a TA01NSN or a TA31RCO-M4CP, you get exactly what the Military gets. Either way you look at it you get the real thing. |
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Posted: 4/29/2009 6:04:42 PM EDT
[#9]
I have a pair of TA31F's.
Its the best ACOG IMHO. 
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Posted: 4/29/2009 6:05:44 PM EDT
[#10]
Thanks all, you have answered my questions..
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Posted: 4/30/2009 4:52:41 AM EDT
[#11]
Just buy the TA31F & be done with it.
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